DoT classes/specs like SPriest, Unholy Dks, Afflic Locks aren't able to setup their damage in this bursty enviroment, and games generally don't go long enough for them to be useful. Sustained pressure is now useless compared to burst because of the 50% plus PvP power we have.
PvP Power in it's current form is ruining the game and it needs to change.
PvP Power was brought in to stop PvE weapons being too strong in PvP. One solution would be to use PvP Power as a scaling stat. Some abilities would scale at 1:1 but some of the more OP abilities could have, say a 1:.7 scale. This would mean PvP Power would still be better than PvE gear and Bliz wouldn't have to touch PvE damage, they could just change how much damage abilities would do to other players.
I have never been one shot, but the amount of times I've been taken from full health to dead within about 3 secs is astounding. This needs to change if PvP is to be fun again.
Seriously Blizz/Ghostcrawler fix this game!!!!!!!