Its a sad day as a combat rogue with this new patch.
Having some of the best gear in the game I watched in amazement as casters simply annihilate us in 25 man raids.
The sad part is, prior to the raid I dual specd into Assass to try out Mutilate. With my heroic Rib Spreader, and Regular Lung Breaker i was pumping out almost 2.5k more dps than my combat spec. All I did was simply equip the daggers and switch specs. I don't have a shred of mutilate gear(I realize some gear is interchangeable between specs)...
The overall game play of Combat feels very clunky. Energy regen is insane. There is no sense in timing KS at a low energy point to recup during KS. You will always cap no matter when u use it, so just pop it on CD. Adren Rush is pretty much only useful for the same reason. With energy regen so fast, I only really needed it for the haste buff. And lastly Blade Flurry...Garbage without the haste and now penalty to energy regen (even with the lol glyph).
Mutilate definitely felt much better/smoother to play. And this is coming from a rogue who has never played a day as mutilate in his life..