NB def got some love and now is a decent tank choice, necro is solid as well though messing with the corpse mechanic on something already as micro intensive as tanking could prove to be a pain.

as long as your not going try heard sweats end game everything can tank, so play the one you want.

Just a things i'Ve seen two days ago. Good to see my friend with tank from many classes, well his favorites are Warden, Necro and DK, but i was amazed to see his Tank 2 days ago in vMA, standing there still, pulling itself alone all mobs to him, specialy on Stage 2, standing right in the middle of the moving blades, with 25 bleeding DoT stacked, all 3 bosses robots stacked to togehter and seing his life merely droping a hair. Was hilarious, though the build eh made relies on dmg, so when he moves and deosn't get much damage he can get in trouble, but still i was surprised. But again, each clases has their speciaty and situations, some mroe serious, some a bit more dps, some for dungeons, some more for trials, some better for longer fight, some better for fast pace fights... if only i was good at tanking, seems on my side is a healer from many classes and dps