MoP was faster paced but no class had anywhere near the burst damage that Sub currently has, which is the problem. High damage is fine if it happens over a stretch of time, but Sub can currently do Cheap Shot -> Dance -> Symbols -> Echoing Reprimand -> Evis -> MfD -> Evis with Drestagath anywhere in there and kill someone from 100% health basically every time. That's 3 seconds to kill someone and they're stunned the whole time. If they trinket you can just Cheap Shot and then continue on and kill them in the DR stun anyway. The only classes you can't kill that way are ones with immunities.
The faster the game is the less chance there is for skill to matter. If a Rogue forces every single defensive from you every time they open there's no decisions being made, you're forced to react that way in order to survive. Dampening games are boring, and nobody likes 10+ minute arenas because the first 5-6 minutes don't even matter, but there's a good middle ground of games taking between 3 and 5 minutes where there's a lot of decisions to be made. And I think if Rogues get nerfed a bit we'll be there for basically every class, there's enough damage on casters and other melee to end games before dampening, but not so much that the game ends in under a minute.