if you want to feel like you're tanking, play paladin. that's my favorite. it feels so awesome to pop Tempered Will (resist knockback) and Cover to prevent a damage dealer from getting kicked back. that being said, it doesn't really matter for beating the boss. that's why most people couldn't care less

if you're a typical prima dona tank (a damage dealer who wants to be in the spotlight), then play warrior. i admit, warrior is fun, but it's no tank at all

drk is the most interesting. it's the reluctant tank. he spends most of his time trying to quickly kill the enemy (swift justice), and only reluctantly does an enmity combo to keep others alive. totally fits the theme: #1 priority is kill the enemy, #2 priority is save your friends, if you have time