Beating rogues in PvP can be either extremely easy, or nigh on impossible
This is pretty much entirely dependent on their available cooldowns. A rogue with cooldowns is a monstrous opponent, and if they really know what they are doing they can be exceptionally hard to beat.
However if you catch one without CDs, or can force them to blow their CDs early, you won't have too much of a problem with them.
If you are being stunlocked, NEVER trinket the first stun - which is cheap shot. Part of what makes rogues annoying is they have 2 utterly brutal CCs which might make you want to trinket. One of these is Kidney Shot - a combo point stun which should be trinketed if you are being wailed on and it looks like you won't be able to survive the duration of the stun.
If you have a healer, and it looks like you can be kept up, eating Kidney shot might be good, the reason for this is an evil ability rogues have called Blind.
Blind is one of the longest lock down CCs in the game, and it's on a 2 minute CD. Or a 3 min CD. I honestly can't remember its been ages since I played on my 39 twink rogue. It breaks on damage, but that isn't the issue. If you trinket kidney shot, and start heavily pressuring the rogue, they can blind you and you will be forced to sit in it for the full 10 seconds, giving them time to vanish and reopen on you - except this time you won't be able to trinket the KS.
Essentially, saving your trinket for blind is one of the ebst thigns you can do, as Rogues will normally use it as a "OH MY GOD I AM ABOUT TO DIE I NEED TO GET AWAY HELP LOL" button - if you can trink it, you can carry on wailing on him.
In a 1V1 with no healer and not much resilience, trinketting Kidney Shot might be a better move - so basically you need to think about your trinket use, and work out whether you are going to be able to survive a full duration stun lock.
Some classes have abilities which remove stuns, like Paladins with that ret talent which I can never remember the name of, Mages with blink, or abilities which reduce the damage they take while stunned. If you have an ability like this, try and save your trinket for blind.
Again though, all of this brings me back to the first point I made, a rogue without cooldowns like Blind, Evasion, Cloak of SUPREME SKILL and vanish etc will be easy, a rogue WITH all of his CDs is gonna be evil.
If you really struggle against rogues in 1V1 situations, don't worry. Blizzard have categorically stated that the game is not balanced around 1V1s and duels etc - and some classes / specs are simply exceedingly strong in 1V1 fights, Rogues are in this list, along with frost mages, Shadow Priests and several others
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