Sev kept saying that sneak attack deals "massive damage". However, how does a pure rogue compare in DPS even while sneaking with a pure barb raged? Or with a paladin? I suspect that SA is not as massive as it looks like, give the weapons those rogues are restricted to and their lack of melee power enhancements.
Add a lot more SA dice or let it crit (or go in the inside the damage numbers that are multiplied when they crit) and then I think "massive" might be a good adjective for the DPS of SA.