I've already cancelled 4 of my 5, and the 5th is likely to go too. I was hoping balance would get some major attention for the next patch, but it looks like they'd rather mess around re-releasing more old content instead of doing any real work.
The sad fact is that the only place you're likely to get good PvP from WoW is on a private server (not that I've played on them, it's just that I've played a lot of FPS games that players run on their own servers, and given the chance, they do a much better job of it than a game's publishers. Cases in point being Counter Strike, Team Fortress and Desert Combat, all being completely player made).
Bliz just do not understand class and team based PvP. Taking a look at the employment history of the devs, it's pretty obvious the focus is all on people with histories of RPG or RTS development, when they really should have a seperate lead designer for PvP, who comes from a mainly FPS type backgound. Someone who knows games like Tribes, Team Fortress, Battlefield etc. would have a much better understanding of how to pursue PvP development, than people who simply don't play those sorts of games.