For the past 2 or 3 weeks, I've ran into this kind of tanks at least once a week, and I usually only spend 1 or 2 days in DF to get weeklies done. They'd sit in their DPS stance, make no effort to get aggro when lost, and let their DPS party members die when they pulled off. This is pretty obvious since the DPS that pulled usually ends up tanking the boss for a good 10 to 15 seconds before dying. All of these tanks would mention using Diversion in party chat, so its not like they're a new tank who doesn't know what's going on, but they're favoring their own personal performance over the party's performance just to push their numbers. So, I've looked up the tanks that have behaved this way, and every one of them were posting big numbers and cleared Omega Savage.

So, is this something you've encountered? What can be done to discourage this kind of behavior? Or, should it just simply be use DF with people you know? Or, maybe I've just been unlucky.