Cause that's what having both the talent and casting MotW on yourself will give you. Not to mention the over 1000 armor it gives. Not quite sure what you mean by "It's just how I play." There's no downside to casting it on yourself... (and on your raid only takes a cheap reagent), it's one of the most powerful buffs in the game, why wouldn't you use it?

As for berserk, as a pure bear, I definitely agree with how you are saying you get use out of it. Once your gear improves though and you stop having threat issues as much, consider getting the glyph of frenzied regeneration instead of glyph of berserk. It boosts your self heal in bear form from about 50% of your total health to around 60%. It's awesome.

Anyway, have fun! I wish I could keep playing, but it sucks up too much of my time to play while I'm taking classes as well. Ah well.