I like being in control of the boss. I want to put him where I want and I like that they just keep trying but can't kill me. I also love the synergy between two tanks and sharing cooldowns, it the most fun part of this game for me being able to work with someone else to accomplish a goal instead of just being a dps worrying about myself. And this game has the best tanking in any game I've ever play because once you figure it out you can do insane amounts of dps and still be extremely tanky.