There exists a lot of complaining in the forums because of the change to dps in WotLK (that is, any dps spec can dps competitively to any other in comparable gear, regardless of class), mainly from rogues.

"Why should anyone roll a rogue now, we used to be the top single-target dps class in the game, now we aren't."

Here's why anyone would roll a rogue now: they like playing a rogue. It's the same reason I rolled a druid back in the day, and the same reason I have a rogue now... I like playing them. Now that rogues have to actually work to be competitive dps-wise, the whole experiment has fallen apart because rogues aren't easy-mode for raid spots.