It is ironic combat now has the best burst of all rogue specs. Unfortunately the damage goes down dramatically when your killing spree hits more than one target. Blade flurry helps to a degree but you still lose half of your poison damages. Killing Spree is also very unreliable against moving targets about wow gold. Say you pop blade flurry then killing spree a hunter and his pet, the hunter disengages, you pretty much waste the entire killing spree on his pet.

I really see this as rogues premier 2v2 spec to get cheap WoW Gold. You burst with killing spree + trick of trade + engineering trinket and your healers nukes; if the target does not die you get behind pillars and play the gouge/shiv keep away game until it comes back up again. I do not know if it has enough survivability/mobility for 3v3 or 5v5 about wow gold, but I can see it working in the right comp as well. You will probably need a warlock who can draw aggro (come 3.1, a destruction/demo hybrid should be very hard to kill yet a world of burst if left alone), and your killing spree is the nuke to finish people off to get cheap WoW Gold.

Tried AR/prep and I still do not like it. Hemo just does not do enough damage even with AR up, and your survivability outside of stuns is actually worse than mutilate/prep (deadened nerve + quick recovery makes a big difference). Mobility is not that much better than mutilate/prep either.  Mutilate/prep is probably still the most well-rounded spec, but I just do not believe it can compete with the top dogs about wow gold. The peak potential of this spec is probably behind us and will never be reached again.