THat's true, rogues are inzane when it comes to dps.
What I love about rogues and warriors, are that they have no limit of their dps, since they don't have to  care about mana. That's why I will say that this are the best classes for long time dps. Okay, warlocks have their life tap ability to recharge themself with mana, but for how long can the healers keep up with that?