I've been playing an Ice/TA for a little while now - should hit level 30 this weekend with them.
I team with a fire blaster and find that I usually open attacks with Blind Arrow/Ice Slick, Ice Arrow Hold, Ice Hold (don't get ice single target immobilize - it's a major End hog) and ensure you remove Web Arrow from your tray asap.
Assuming anything survives the fiery onslaught after that, I keep reapplying holds. EB's require Glue Arrow and Acid Arrow (which is really good, ups the blaster's damage).
I've still to get Disruption Arrow too.
Ice group immobilise is good to keep the group together for Fireball/RoF/Fire Breath attacks from the blaster.
To be honest, I doubt I'd have managed solo with this character, but it's much fun in a duo and since it is a Fire blaster I team with, I've got Aid Other/Aid Self too (and they've been so needed).
"Idealism is such a wonderful thing. All you really need is someone rational to put it to proper use." - Kerr Avon
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I've got an Ice/TA on Onion (Trickslide), and she is indeed a control/debuff monster, but very much a team player (pretty much useless solo). Great fun to play.
At first I didn't duplicate the holds and slows (Block of Ice/Ice Arrow and Shiver/Glue Arrow), but I respecced into the duplicates last night and I have to say it's awesome! Bosses get locked down in double time, the mobs are so slow it's pretty much a mass immob. Great stuff.
At the moment my build (at 25) has only 3 of the Primaries (BOI, Shiver and Ice Slick) and all the possible Secondaries to this point, plus 3-slotted Hover for combat maneouverability, TP for travel power and Stealth, and I've just opened up the Medicine pool with Heal Other.
I suppose it's a bit demented to have only 3 of the Primaries, but I wanted to explore the Trick Arrow options and tbh I find single/double Immobs fairly useless in general (although the Ice ones are pretty), and since I plan to keep flitting about with Hover, Cupid-style, Arctic Air isn't any use to me (though it would be a great power if you planned on going more into melee range as a footsoldier).
Not sure how I'll go after this, I might respec back to un-doubled-up, but whatever happens it's a great, fun combo.
One rather nice thing is that because TA is so end-light, all you need to do is slap an endred in each of the Ice powers and you don't really need the Stamina line, which makes it possible to explore the pools more for fun, as I'm doing.
Well i think my duo partner wants to roll a fire/fire tank, so i figured this might be a good combo. Also i like the idea that it might take longer than 10 seconds to kll a mob, so i might get a chance to use all my TA powers this time round 
with my defender i found the animation times of TA just couldn't keep up with the pace of the team, and i felt a bit useless. I like TA but it just feels so sluggish. I know it has lower debuff values, due to the lighter end costs and fast recharge, but i also feel it needs faster animations, because you need to use lots more powers to do what other sets do with one or two.
incidentally, which origin is it that has a power that can light oil patch again? Shouldn't be a prob with a fire/fire tank but i'd like to have a backup.
I miss him in the weeping of the rain;
I want him at the shrinking of the tide;
The old snows melt from every mountain-side,
And last year's leaves are smoke in every lane;
But last year's bitter loving must remain
~Edna St. Vincent Millay
I've a Grav/TA Controller I tend to solo a fair bit with (but no Ice experience so take all this with a pinch of salt). Currently at level 29.
Ice Arrow is my "I'll keep you until later" hold, taking one mob out of the equation while you focus on the other (due to its slow animation time its not as good a in-combat hold really). I have it 4 slotted, 1 accuracy, 3 hold. Its super as a one-two for insta-holding bosses.
Acid Arrow should always go on the other target for the -resist & the -def (so you can hit them with your hold and do a bit of extra damage). Currently this is 1 accuracy, 1 recharge (to make it perma : it won't stack with itself debuff-wise) and 1 -defense. Wouldn't mind throwing another -def in there though.
Disruption Arrow is great, got it at 28 & slotted with 3 recharge SOs and planning at 30 to get Haste to get it self-stacking.
I left out Flash Arrow since the -accuracy is pathetic (5%) and I don't need the -perception (Grav is all ranged so I don't need to run in to drop anything). You may need it with Ice alright (I have Smoke on my Fire controller for getting into position before striking). Slotwise its a cheap power too, no extra slots needed.
I have Poison Gas arrow as I wanted to test it. I've satisfied myself that its a waste of time so I'm dropping it as soon as I can. The 60% chance of a 7 second sleep just isn't worth it, even solo.
The only thing I've used Entangling for is at the very start of the game as a Containment set-up move. Plus Hellion pistols have rubbish range so I spent the first 10 levels using it to kite them.
Edit : Magic or Tech will make the Oil Slick go WHOOSH
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I have Poison Gas arrow as I wanted to test it. I've satisfied myself that its a waste of time so I'm dropping it as soon as I can. The 60% chance of a 7 second sleep just isn't worth it, even solo.
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What about the -damage though? As i may be duoing with a resistance set tank, surely that would help out?
I miss him in the weeping of the rain;
I want him at the shrinking of the tide;
The old snows melt from every mountain-side,
And last year's leaves are smoke in every lane;
But last year's bitter loving must remain
~Edna St. Vincent Millay
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I have Poison Gas arrow as I wanted to test it. I've satisfied myself that its a waste of time so I'm dropping it as soon as I can. The 60% chance of a 7 second sleep just isn't worth it, even solo.
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What about the -damage though? As i may be duoing with a resistance set tank, surely that would help out?
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Personally I hate the power, the -20% damage alone just isn't worth a power cost for me. I'll be better off dropping it for the medicine pool I think and just healing any damage back
Was thinking of my tank though -20% dam is equivilent to +20% res to everything is it not? unless i'm getting the concept wrong, so that would beef up his sheilds....in theory.
Anywho i expect i'll have far more free power slots as ice/ta than grav because there's fewer useful powers in the primary, so i might be able to fit in in.
I miss him in the weeping of the rain;
I want him at the shrinking of the tide;
The old snows melt from every mountain-side,
And last year's leaves are smoke in every lane;
But last year's bitter loving must remain
~Edna St. Vincent Millay
Dont forget that using Poison Gas Arrow after Acid and Disruption will make it a lot more powerful...
(as -dmgRes is the same as -dmg debuff Res).
And imo its got a sexy animation too 
*waits for Miss Marv*
How does that work? poison is -damage, not -damage resistance.
I miss him in the weeping of the rain;
I want him at the shrinking of the tide;
The old snows melt from every mountain-side,
And last year's leaves are smoke in every lane;
But last year's bitter loving must remain
~Edna St. Vincent Millay
Anything that does -DmgResist also increases how powerful your -damage powers are in the game.
Given that Poison does 20% normally and Disruption & Acid do 15% apiece that means about 27% with both on the target too I believe.
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How does that work? poison is -damage, not -damage resistance.
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Indeed, debuffing the mobs DmgRes first with Acid and Disruption, will increase the -dmg that Poison debuffs.
As the -dmgres's will also be debuffing the resistance to damage debuffs.
If you follow 
not at all no, but i'll bear it in mind anyway, ta 
I miss him in the weeping of the rain;
I want him at the shrinking of the tide;
The old snows melt from every mountain-side,
And last year's leaves are smoke in every lane;
But last year's bitter loving must remain
~Edna St. Vincent Millay
IMO Poison Gas is not a good power for a /TA controller, since you should be completly negating incoming damage by controlling the mobs, the debuff is usually redundant.
My Controller TA guide.
I really should do something about this signature.
I agree, poison gas arrow looked great on paper and has now been respec'd out. If things were going well it was not needed, if things were going wrong it was not enough
"Well, they found my diary today.
They were appropriately appalled
at the discovery of the eight victims
They're now putting it all together.
Women wrapped in silk
with one leg missing
Eight legs, one body, silk,
spider, brilliant!"
I've always wanted to do something with TA, but my defender was an astonishing disappointment, so i'm thinking it may work better as a controller secondary. Ice is the only primary i've not tried and looking at it there seems to be a lot of potential synergy between the sets.
Shiver and glue arow for a massive slow, 2 KD's in ice slick and oil slickand assorted -res debuffs to throw on top of it. Also, alot of the powers are locational placed powers and so tend to affect everything in the area, ignoring the aoe cap (afaik), so this combo could control and debuff very large groups.
Am i way off base with this or would it work like i think? comments, suggestions, random insults...
I miss him in the weeping of the rain;
I want him at the shrinking of the tide;
The old snows melt from every mountain-side,
And last year's leaves are smoke in every lane;
But last year's bitter loving must remain
~Edna St. Vincent Millay