sadly that's the case Whar, once people are geared up, they get spoiled by 25man raid tanks who have 30k+ hp. there's absolutely no reason you can't tank heroics in EITHER setup, one is more avoidance focused i presume and the other is more EH focused. I'd say the 2k hp outweights the small defense gains though. Sadly these people just exist and will give new tanks hell. Get into a good guild and just do guild runs.