In my experiences with healing, it's only really Paladin that can heal itself for an extended period of time. Gunbreaker only gets so much with Brutal Shell and HoC, Dark Knight's Abyssal Drain is on a 60 second CD, and while Warrior's Bloodwhetting allows it to heal to full, the duration of that effect is only four seconds.

So in dungeons Warriors may seem a little intense healing wise, but in trials and raids the healing isn't really that big of a deal. Most importantly I think the current Tank sustain abilities are very fun. I'd love to see Dark Knight maybe get Abyssal Drain more often.