One thread over at the forums sparked quite a discussion when it asked what the problem was with World of Warcraft PvP. It's a pretty good question and definitely not something with a simple answer, but Ghostcrawler took up the task and addressed several issues in his usual forthcoming fashion. In a nutshell, Blizzard views the following issues as the primary problems of PvP:
Too much emphasis on Arenas and not enough on Battlegrounds.
Too much emphasis on 2s and not enough on 3s and 5s.
Not enough class / spec representation in Arena. Warlock, hunter and shaman numbers in particular are too low, but they're not the only ones, where comes the different wow power leveling surroundings.
Too fast-paced.
Ghostcrawler proceeded to explain the last point in detail, talking once again about burst damage and reiterating their intent that PvP should be a balance between damage, healing, and crowd control, otherwise it is unfair while the world of warcraft power leveling, He says that Blizzard plans to "add an extra GCD or two" in the small window where a player can either be healed to full or fall to enemy fire, allowing players to better use their full toolbox. Anyone who has ever played Arenas should know that that's a pretty tall order.