Passive sources for our damage remain unchanged.
Rotations (for combat and assassination) remain largely unchanged.
Mechanics remain unchanged - or worse still - have changed negatively (BG I'm looking at you).
Combat used to be a reasonable target swapper - poisons were decent, but not a primary damage source, rupture wasn't essential to dps (not that it is now). You could swap targets and nuke with a small ramp up curve for dps. Nowadays though, with bandit's guile factored in, with energy regen as crazy high as it is, target swapping has become a nightmare for the spec. Assassination was regarded as the tunnel vision spec in wrath, the poor target swapper. It has also gotten worse at target swapping thanks to venomous wounds in part, but, ridiculous as it is, it's now considered the BEST rogue spec for multi-target damage. That's how bad combat has gotten.
Our aoe used to be strong (VERY strong) - now it's mediocre / terrible / laughable depending on spec.
And honestly, I feel as though I've been lied to.
"Less passive damage sources" - Here's +30% ap / agi / +20% melee damage passive spec bonuses.
"Less reliance on cooldowns" - Here's 3 new cooldowns!
Being serious on this point though - They did promise us that we would be less reliant on our cooldowns. Making prep a sub only talent seemed like a step toward that goal. But instead, all that achieved was to prove that our class is still incredibly cooldown reliant. Any spec without prep is not pvp viable currently. The moment a mutilate rogue could not reach prep was the moment pvp-mut died. Nothing was done to change this, nothing was given to counter this (quite frankly) crippling loss. If anything, we're more cooldown reliant than ever - to the point where they're forcing shared cooldowns on our abilities now.
We may have been fun to play 5-7 years ago, but the truth is, we haven't evolved as a class in general, and when something goes for so long unchanged, (or again in the case of combat - actually gotten worse due to horrible design choices) it gets BORING. And that's what rogues have become.
We play like a vanilla class still. We're a relic of an older paradigm, and we don't really fit in with the modern game right now. We're the square shape being forced into a round hole, and it doesn't feel right.
Sorry for the rant.