If you think a warrior is useless you just don't know how to play.

I felt the exact same way at one point, I wasn't able to do good DPS because I did the SOR from 32-80 and had no idea what I was doing even though I researched it on noxxic.com. After a while I got used to playing the class and it's a lot of fun. I would suggest switching specs if you really hate the class that much.
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Warriors have been terribly nerfed for pvp but bull some of the craziest dps endgame. Fury is best at endgame with Titans Grip and an item level of 385+. I have a warrior myself and they get more and more fun as you progress through expansions.