I wanted to follow up with another post relating to the expectations of the OP. My main is an Ice/Cold Corruptor and I enjoy PvPing - however, I have found that debuffs in general are not as 'powerful' as sheer damage output in either arena or PvP. I 1v1'd a Spines/Regen Scrapper in the arena to test this theory, and even with Benumb dropping the other player's regeneration, my -rech/slows hardly did anything to mitigate their movement or attack chain. This may be due to diminishing returns, but it also may be due to slow resistance from some IO sets. Either way, I had high hopes for -slow, -rech, and -regen coming from Ice/Cold, but have not seen the levels I experienced on live lately. Then again, perhaps if I rolled an Ice/Cold Defender, the debuffs would scale higher (but I would miss out on Scourge!).