I dont lose to warriors very often. I had a memorable one a week or so ago, it just seemed like he had infinite health. I couldnt seem to DPS him fast enough, even though i nuked the crap out of him. In any case, that is pretty rare to lose to a warrior. But you have to move move and move some where. Do not stand still very long at all. If you have your blueberry out sac him for the shield and the Warrior is dead meat. Rogues on the other hand.......
Good luck, just practice, you will figure out the spells/combos that work for your style and spec, dont sweat it.
Kai
