@ OP Never post pvp orientated debates on mmo forums. It's filled with pve nerds who love to just shut you down to make themselves feel better.
Anyway...
The warlock's self healing and natural damage reduction through Soul Link is because they ahve no defensive CD. They have teleport, which is simply a blink without the stun removal. The obvious advantage is the range and the fact you can portal out of LoS (Which usually isn't great cos you're then LoS'ing your healer).
The mage's self healing through evocate is fantastic due to their ability to reset the fight, but it has a long CD and is their only method. Their trade-off is heavy defensive CD's with sheilds, wards and of course Ice Block.
Now on to hunters. The reason they don't have any self healing is simply because of the amount of abilities they do have. Can i assume you play MM for 3s and survival for 2s?
Survival has the most CC of any class, without doubt. And it's main advantage is, it's also 3 differnt types. Scatter = physical, wyvern = poison and trap = frost.
On top of the CC, they have a tonne of defensive CD's. And a reset button with... *forgets name*. The MM talent :P
That is blizard's reason for not giving hunters another spell.
As for rogues... it' unclear how it will fare, although judging by how hard melle rape rogues if they catch them, it only seems fair.
tldr: Hunters have enough abilities to defend themselves without needing to directly increase their hp with a new spell.
---------- Post added 06-15-2010 at 08:11 AM ----------
And give up on the "My comp is better than yours". Every comp has a hard counter, and frankly when you've got 2v2 beastcleave, all warrior teams, and double melle cleave dps teams, i would say hunter priest requires a lot of skill to get about T1. CC co-ordination and joint burst.