Warriors are not on top because of AoE, or they wouldn't be topping Festergut fights. They're top because of ArP and Smourne, and overscaling. It's just how WotLK is, as I said above. Warriors know it, other classes know it, Blizzard knows it and admitted it as a mistake on WotLK.
I think mage is the ultimate best single target DPS, then comes hunter and warrior, rogues should be good as well. Idk if they are broken here or what, but I rarely see any good rogue.
I've wondered this too. Are there simply a glut of **** Rogues or is something fundamentally broken about them on Lordaeron? Warriors and Mages are the kings of WotLK DPS but Rogues should be able to pull very good, competitive numbers.