Those people don't know what they are talking about lol
My dom is now lvl 50 and does an unreal amount of dmg all round - and he does NOT have aim! I think most people take too many of the thorns powers and screwup the slotting. On Starscreamer the only thorns powers he has are:
Thorny Darts (3 slots - none of which are dmg lol)
Skewer (5 slots)
Fling Thorns (4 slots)
Impale (5 slots)
Ripper (6 slots)
Thorn Barrage (6 slots)
For reference I took maneuvers/tactics to give some balanced (if minor) def and to have a perma tohit buff rather than aim. Yes, later on much has resistance to lethal, but yet less has resistant to Toxic so teh DoT can be such a difference maker. The key to kicking [censored] big time is to not skimp on the slotting of your controls as with people pinned down you can tear em apart and stack all that -def and DoT and let the orange numbers just rain down.
Only thing I would say is avoid the pbaoe attack like the plague as it roots you for way too long with too [censored] an acc and range. Better off with fling thorns tbh. Plus as you are fire, you already do bags of DoT so can really be a cruel dom all round 
If ya want more info then chuck me a PM or look me up in game. EDIT: Although bare in mind my glorious dominator perfection is gravity/thorns so may vary a bit according to ya primaries and pools
Fire/Thorns was the first Dominator I ever made... it's a pity I got confused with the difference between Immob and Hold. He lasted a few months before I deleted him. I've re-rolled him a few times since but he just didn't "feel" the same. I remember it being a good combo though, even with my complete lack of game knowledge back then.
Enjoy it, I might have to join you in making one 
@Jay Leon Hart
Kerensky: this has nothing to do with underwear
Zwillinger: I put on my robe and wizard hat...
Synapse: I had to resist starting my last post off with "Yo dawg!"
I have one in the pipeline.
Throntrops plus Hot feet looks an extremely attractive combination.
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However i hear alot of people saying thorns is rather weak damage, but if i look at the set it isnt that bad? Both ranged and melee they have imho decent (sadly lethal) powers, including a KD and Immobilize power. Add Aim to this, its not that bad?
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Aim is the certainly the jewel in the crown of /Thorns, especially when you combine it with the inbuilt -Def of the set; as far as damage itself goes, it's probably worth noting that Union's first PvP Dominator was a Plant/Thorns, and he didn't have any trouble getting his kills even before the numerous Dom buffs since then.
@Synaesthetix
"Here, take some more bees with you. You may need them."
Union: FU//LoUD
"that Syn is that that" - Mothers Love
Also worth noting that he was probably the best PvPing Dominator Union has ever seen
However, it should be known he said it was a very diffifult Dominator to play, PvE and PvP. Also, AFAIK, it's not KD, it's a KB.
PvP wise, I have to be honest and say I've never found anything /thorns to be much of a threat, and if I have it has been more the Primary that matters. With Fire/, you should be doing a lot of damage after 32 anyway, and Aim is a pretty hefty damage boost. Thorns seems to lack burst damage though...
Thanks for the replies thus far, boosted my urge to continue this dominator alot (Abu kept punching me over a year now to get a domi).
I call him my blastascrappatroller, with more focus on ST damage output to team up with friends who have more controllish dominators.
50)Sinergy X/(50)Mika.
(50)MaceX/(50)Encore
Sign the petition, dont let CoH go down! SIGN!
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Aim is the certainly the jewel in the crown of /Thorns
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Listen to the heroes cry out "Save me Jebus!"
save me jebus? more like my superpowered empath 
will be healing and CM'ing them before you can hold, slow, or kick the [censored] outta any of my freind'in'spandex, but i really do llike domi's there strength is like a scapper,blapper,blaster,troller mutant that owns all of the abbove (unless im there with my superslotted healing )
After trying basicly every set possible in the dominator AT, i finaly found 1 i seem to like. Fire/thorns.
However i hear alot of people saying thorns is rather weak damage, but if i look at the set it isnt that bad? Both ranged and melee they have imho decent (sadly lethal) powers, including a KD and Immobilize power. Add Aim to this, its not that bad?
50)Sinergy X/(50)Mika.
(50)MaceX/(50)Encore
Sign the petition, dont let CoH go down! SIGN!