Just remember, you are not a heal0r, even if Thermal has Heals. The other stuff from Thermal is the stuff that really rocks your teams' socks off, so focus on that as well.
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As a support toon Rad/Thermal is nice you buff everyones resistance, have heals, debuffs, forge which buffs someones acc + dam (can keep it on 3 people at least), and the rad blast would effectively increase everyones accuracy. Personally I would at fire or sonic. Fire for the aoe madness and sonic for the -resistance which effectively increases everyones damage, also stacks with melt armours -resistance, which is more desirable than the -def rad offers. Rad/Thermal will work fine though if you want rad just as you can keep quite a half the team forged the secondary effect is kinda wasted 
thePhilosopher Martial Arts/Regen/Fire Scrapper
theRegulator Empathy/Energy/Soul Defender
Total Inertia Ice Blast/Kinetics/Psy Corruptor
Total Inferno Ice Blast/Thermal/Leviathan Corruptor
I duo with a Rad/Thermal and I must say it works well. Dont expect too much from your Nuke though.
The 3 AoEs in Rad means you're able to add a fair bit to the teams damage, and def debuff is always good
"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 love my Rad/Thermal. She's built for support thus far but she's oh-so-fun to play.
Cosmic Burst is a great Disorient and everyone will love your shields.
@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!"
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I duo with a Rad/Thermal and I must say it works well. Dont expect too much from your Nuke though.
[/ QUOTE ]Bah, you just don't notice it since you're so fixated with your lightning rod 
The nuke does very nice damage, with aim and melt armor it almost kills lieuts. One red insp, aim, MA, neutron bomb and nuke will kill minions and lieuts from the group unless they have high NRG resist.
Oh, and there aren't really any flaws in the combo, except that it isn't that hot solo (Although I did solo a longbow ballista in mid-20's with tray of insps), the killing speed is too slow.
I play a Rad/Traps Corrupter fairly regularly and I'll second the fact that Cosmic Burst is awesome. Radiation Blast has what feels like a crazy amount of Area of Effect attacks that synch really well with team play because it'll debuff entire mobs as you fire them off one after the other.
To be fair, this looks like a pretty good combo. With Radiation you'll be able to debuff higher level enemies so that the team can hit them, and your secondary will keep your team alive/running strong. So for going after enemies that might be a little too high in level, you'll be welcome company. And despite the stigma, don't be afraid to be the healer once and again. I've a Fire/Thermal corrupter my Brute partners with regularly...as a duo she's able to keep my alive so well its insane, even when things go very, very badly.
Oh and the Radiation Blast Versus Sonic Debate:
Radiation debuffs the enemy so you can hit them more easily. More hits = more damage.
Sonic debuffs the enemy so that they take more damage when you hit them. Fewer hits = more damage.
Both would work really well for a team /thermal...but I'd go with Radiation if you want to be going after purple/red enemies with some regularity. I prefer it and it doesn't come with a lot of annoying train noises (as Sonic does). I'm not a fan of fire as while it's great for AoE damage...that's all it has going for it. And lots of Aggro. So the mobs aren't debuffed and you have their undivided attention if the team doesn't already.
Rad/Thermal can be a good team character. It should be soloable at a push, especially at lower levels - depending on how you build it, of course - but it'll shine much more as a support character.
The nice thing is that Rad has a couple of really nice attacks that aren't so quick, which means they're perfect for firing off every-so-often when you have a quiet moment where you don't need to buff, debuff, or heal. (Also handy because there are so many good powers to take from Thermal, but you don't really need a ton of your primary.) Cosmic Burst and Irradiate are the really stand-out powers in the set - careful with Irradiate though, it WILL get you killed at lower levels and on poor teams, it pulls in an amazing amount of aggro.
Being able to stack -def from your attacks and Melt Armour is very nice, especially when you can Forge people. Very nice on enemies with high defense, including AVs/Heroes with a some kind of power that gives them very high defense. It's good in the PvP zones for that reason, too.
Seconding what Alvan said, just remember you're not a healer. At low levels, you might feel like one, but later on you're much more of a buffer and debuffer. I found it actually started out a bit slow, a bit dull, but really came into its own with the debuffs in the late 30s. Stick with it!
Bah, irradiate is for nubs, EH and Neutron bomb are better damage
...Although I might try to fit irradiate in as a 3rd AoE in a respec.
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I duo with a Rad/Thermal and I must say it works well. Dont expect too much from your Nuke though.
[/ QUOTE ]Bah, you just don't notice it since you're so fixated with your lightning rod
The nuke does very nice damage, with aim and melt armor it almost kills lieuts. One red insp, aim, MA, neutron bomb and nuke will kill minions and lieuts from the group unless they have high NRG resist.
Oh, and there aren't really any flaws in the combo, except that it isn't that hot solo (Although I did solo a longbow ballista in mid-20's with tray of insps), the killing speed is too slow.
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If you can get as much damage out of your nuke as I can out of Lightning Rod I shall notice it more.
At least the hold side of things means I can burn the ones you dont kill
"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!"
Here are my experiences and why it's sometimes not so funny to be the all-around supporter.
Well, after having played my Rad/Thermal to lvl 30 by now, I still enjoy her a lot. Although sometimes buffing is a real annoyance to me. I find myself buffing up 8 people with Fireshield (yes, I didn't take Radiationshield yet, because buffing without it already is a fulltime job) and having people die in the meantime because they won't wait to let me finish buffing up... But that might be every healers problem 
I know I'm not a real healer, but people expect you to or why would they tell me asking "are you a healer?" or "do you heal?" before inviting me into the team.
Don't get me wrong, I picked this combination because of the debuffs and most versatile healing capabilities on Villain side. And I certainly don't mind healing because I enjoy playing support characters.
But due to the game mechanics which require you to stand still to buff, the short duration of the buffs (yes, I know there are even shorter ones ) and the sometime short area of effect I find it very difficult to play my char as I would like to.
So the soon to be respec drives me into a deep dilemma 
Right now, I can get along alone rather well, and I don't have that much problems in smaller teams. But in big teams with high difficulty mishes it's sometimes very stressful...
I really don't want to miss most of my Damage Skills, but there are also some additional great skills in Thermal which I consider as essentials. But is it really necessary to have both shields? I mean keeping 8 people buffed up with 2 shields, Thaw on 3 people all the time, keep bosses debuffed with 2 debuffes, the occasional round of aoe debuffs and keep everyone alive with Warmth, Cauterize and Aid Other... well I think thats no fun playing anymore 
Or did I simply not get the point in being a Corruptor? 
(playing this game for approx. 5 weeks now)
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... and keep everyone alive with ... Aid Other ...
Or did I simply not get the point in being a Corruptor? (playing this game for approx. 5 weeks now)
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Yup 
But no worries, we all start at zero and ascend.
As the topic title implies i am thinking of starting a Radiation / Thermal Radiation corruptor and i wanted to know id there are any real flaws in the combination rather than waste my time to only realise the flaw at a later level. I will be looking to team most of the team just thought i'd post that so it can be taken into account.
Thanks in advance