>>1
Rogues make money easily, are great at everything early levels but begin to suck later on. You'll still be topping the damage charts in PvE but EVERYTHING in PvP becomes a nightmare to kill if the players aren't braindead. You'll need the BEST equipment to take out most of the people you find, compare this to a new 60 shadow priest that can walk into a battleground still wearing crap gear and top the scoreboard. But it's not like that's the focus of BGs anyway.
>>5
You're not going to be supporting much as a rogue, if you want something that can solo well and still be able to support try out a druid or warlock, the talent build decides how good you'll do in anything.
>>9
You do plenty of damage compared to what? A resto druid whacking a mob with a staff? I'm not trying to insult you or the class, that's just the truth.
>>13
What priest? What spec? What race? If an undead shadow priest throws devouring plague, sw:pain and vampiric embrace on the rogue, the rogue only going to live if they can blind, sprint, prep, sprint, chug a pot and vanish. If the priest has their trinket up it's over before it starts (this assuming they both know how to play).
Probably the same dead with a disc/holy priest after the talent changes.
In conclusion, play every class until you find what you like.