Hey I thought it would be a fun idea for different classes to post tips for how to help a warrior beat them. Things you wish an opposing warrior wouldn't do. I'll do tips for warriors against my main, a spriest, for example.
1. Time your interrupts, when play against a good warrior I know I can not cast a shadow spell when he is in melee range. Therefore I try to use horror, fear and kiting to get off any non-instant spell.
2. Trinket Horror, I generally try to get off a VT and/or MB during the fear. This is a great time to use pummel to build up some pressure.
3. Berserker out of Fear immediately. Some warriors wait until they move into charge/intercept range before using berserker and then charge in. This wastes your charge, lets my fear CD be shorter than your zerker CD and prevents you from keep up pressure.
4. If I pop out of Shadow Form to heal, interrupt and apply as much pressure as you can. If you can keep the priest from feeling secure enough to shift back into shadow form, you'll keep him playing defensively, leaving you to play offensively.
Lets hear your posts/tips for how to beat your spec! Keep it positive.
EDIT: Please keep things constructive, posts saying that x class is impossible to beat or insanely OP is not helping anyone get better at PvP, which was the point of this thread. Thank you.