While I've met people of every class who have annoyed me, from warriors to shamans to mages to hunters to paladins, of the stories I have to tell about absolute jerkwads, it's usually a rogue. It was one of my guild's leading rogues who liked to tell racist and sexist jokes to my wife, and another of my guild's rogues who managed to offend the entire priest core of our guild to the point where they wouldn't heal him at all. So I can empathize with Mirshalak's position here, and even speculate that there is something inherent in the mechanics of the rogue class which set up and reward lone wolf playstyle in some fashion.
But clearly Karthis is right. You can't judge a whole class by the few jackasses you meet, and everyone has a different personality and is irritated by different things. While aspects of rogue gameplay (their stealth and ability to vanish, their stunlocks) might contribute to your irritation when you're PvPing against them and might leave you cold while dealing with them, these are not aspects that will irritate everyone, merely personal biases.
Rogues absolutely do deliver mana-free, easily regenerated, self-sustaining high DPS that no other class can deliver in the same fashion... no waiting for rage, no watching one's mana... and they also bring the versatility of their particular form of CC, which while requiring some care is hardly shabby. Heck, in my own experience in my horde guild, rogues have saved the day on more than one occasion, and not purely through their DPS either. If you've never seen a rogue totally stun-tank a mob that's gotten loose, it's worth seeing. Rogues offer more than generic DPS, and a good rogue will change how you view the class just like magic.
Mirshalak is entirely reasonable in his follow up post where he admits Karthis has a point and that players of other classes can also be gigantic tools. So we'll just have to agree to... agree, I guess. Rogues are not to be held responsible as a class for the behavior of the jerks among them any more than I am to be held responsible for what that really bigoted white power moron of a warrior said in my Steamvaults run last night. Seriously, that guy? Made me sick to be in the same game with him, much less to have a character of the same class. I could not drop that group fast enough.