Too much overlap in PVP?

I have begun to wonder recently if there is too much class overlap in WOW. My Mage alt recently made it to 70, and I have been PVPing in BGs a lot for fun and gear. (Side Note: I twinked on my mage at 29 and 39 for quite a while so I really haven't PVPed on him in about a year or so. Most of my PVP experience with him is pre BC.)

The first thing I noticed at 70, is that all my magical buffs are getting dispelled most of the time. Used to be that only Shamans and Priests would do that. Now you have Locks with their little fel hunters knocking stuff off. Add to that the plethora of Hunters, and it starts to get ridiculous. What's the point of having them if they are so easy to remove? This ability made sense when it was limited to a few classes and builds. But now it seems like its out of hand.

Why do rogues need a ranged attack ability? Deadly throw? Please. Melee only need the ability to pull mobs. Should a warrior have the ability to do real damage like a hunter with a bow or gun? I suppose that will be next. lol.

Why not give my mage frost "plate" armor? I should be able to have 12000 armor right?