Hunters got stealth (real stealth w/ the camo glyph). Monks are kick-ass (literally). Combine this with the lack of changes for Rogues, and you have a recipe for a whole lot of players abandoning ship.
Though, I don't blame Blizzard too much. During the class feedback during Mists beta, I saw a lot of "We're fine the way we are, but get rid of poisons" garbage. Way to ask for the moon, guys. :P When I posted I at least mentioned getting rid of so much passive damage and most of the talent issues (some being addressed with the next patch). I've also noticed a distinct lack of the sweet cosmetic minor glyphs most other classes have gotten and have provided some suggestions there too (Glyph of Disguise is the only thing close, and the canceling in combat makes it pathetic).