...I learned the hard way having to deal with rogues by being ganked over and over and over in STV. Today I can say I have a fighting chance with taking on most rogues. I am currently leveling a (38atm) rogue to understand how to kick their asses as a priest but also to enjoy the character for it's own class. What I do NOT and will NOT ever do on my rogue is do random, ganky killing of squishies, i.e. priests and mages. Just my personal choice. Everyone else though...
In dealing with a rogue it's kinda obvious that they will hurt like hell when they ambush crit you. My first instinct is to fear as a priest (and blink as a mage). The VERY first thing you need to do with a rogue is dot their ass. Stop them stealthing as that is when they are most dangerous. Obviously fear (and blink) have a cooldown so you need to know your class to how to survive the daggers coming at you. Mages nova the rogue to the ground and just get out of there. You can get some distance with blink which should have cooled down as the nova holds them. Heck, just get out of there. Move on. As a shadow priest I can pretty easily dot and flay a rogue to death. Fear should be up pretty quick so dot and heal. A good shadow priest can own pretty much own rogues unless they really rock at pvp and are out to be squishy killers. A holy priest can keep himself/herself alive through the onslaught and dot and fear accordingly.
So, rogues
can be handled by making sure they are dotted, frozen down, feared, flayed, etc. Yes these things have cool-downs but if you let a rogue start shredding you with his weapons or get behind you then it's not looking good for you.
I've had great satisfaction of taking down ?? rogues with a shammy friend just because we kept him dotted, feared and frost-shocked. Slow them, dot them, fear them and call for backup....
People like to know when a rogue is being naughty so you should
usually get help if you are polite and informative in asking for help in local defense.