Playing in debuff is really the only way to survive the summer heat when your A/C goes out.
As for Buff/Debuffing, I thoroughly enjoy playing my Water Blast/Poison Corruptor. It's actually pulled aggro from Tanks, I call it my 'Debuffett'. I have to agree with the other poisoners that you really need to be in the think of it for Poison to shine.
My Kin/Arch is my greatest team multiplier, all those team buffs while simultaneously debuffing enemies? What's not to love? Repel is probably the only thing I've never taken out of the set. I'm sure there are others that can give perfectly good reasons on taking Repel, so I'll leave it up to them. :)