The second part or let us say the main reason I like to play wow on warmane is the pvp system. When I'm bored at pve or just waiting for the daily reset I do pvp. As a rogue I can pick my fights, avoiding group battles, taking objectives (for example mines in alterac valley, towers). Or just can sneak around and pop up as a tree and do some healings.
Let me get back to hunter. 3 shadow priest dots and you will die. or will take at least 20-25k (90%) damage over time (this is a matter of 3 seconds). And there is no defense at all. You have to run away, feign death and eat food for 10-20 seconds to stay alive.
But regardless of "shadow priests" every other class has a certain characteristics which makes hunter a sitting duck: for example:
1. The one who runs into your melee range, disarm / fear / root and or frost novas you.
2. the one who use "dispersion", LoS and heals himself (behind ore mines, fences, buildings, trees)
3. the One who can pull you into his / group range or charge at you.
4. Flying and landing into your characters melee range outside of battlegrounds.
5. Dots (like spamming "Devouring Plague" most annoying tactic ever).
I was playing on cata for some time and I know Hunters have at least 2 or more abilities to heal themselve but on wotlk I can't get into it and I'm death to most dots when I'm on my own. I know all the avoid things, but as a hunter you can't fight back in your defensive skills and like I mentioned it above there is no really chance to avoid anything of the "5 points".
I also have 4- / 500 or more hours on a mage. iceblock / blink are so cool to avoid many things but as a Hunter .... hmm.