Now we have TANKS posting in the TOP TEN on WoL? Jesus Christ. This is one of the reasons I stopped playing this game, the balance is simply atrocious. I played pure DPS, and there was a time when that felt good because you did the most DPS. Then they felt bad for hybrids so they made them do good DPS, but there was a small "hybrid tax" meaning they did a tiny bit less (estimated to be around 5%). Then somewhere along the line that idea fell by the wayside, because hybrids seem to do just as much DPS as a pure nowadays, and no one even says shit about the hybrid tax anymore. However, I can deal with that, because I'll win by being a superior player and generally being the tryhard that I am.
But then in MoP I started noticing that on certain fights, mostly when AoE is involved, my tank would outdps me. That pisses me off. That should never be possible I don't care if he's in heroic raid gear and I'm wearing grey boots off Hogger. Okay, bad analogy, but you get my point. Shouldn't be #*@!ing possible under normal circumstances.
And honestly I don't care if tanks are having fun DPSing. If they find DPSing so fun then they should stop tanking and spec/roll DPS.
And finally...I see this as a problem for tanks as well. the name of the game for many years, when it comes to tanking, has been homogenization. Make all the tanks more or less the same so that you can "take the player, not the class" when it comes to selecting your tanks. When DPS comes into consideration, however, it makes some tanks superior. Some simply do more DPS than others. You could say "well just homogenize tank DPS", but Blizzard already have enough balancing to do wihtout that taking up room on the to-do list. Tanks shouldn't have to be balanced in that way, all tank DPS should be so low that it's a non-factor to all but the most hardcore of guilds.