So there was a bit of a discussion about this on the official WoW forums (http://us.battle.net/wow/en/forum/topic/2522073685#1). WoW pvp tends to be seen as completely meaningless by the non-WoW community (and a few of us veterans that play it with out friends). Territory cannot be controlled due to the large amount of instancing, pvp tends to be restricted to BGs since that's the most efficient way of earning currency, and the best stuff is gotten through highly restrictive "competitive" ladder matches that usually only exist in MMOs via player-run events, whose prizes are also given by the players.
The latter makes it sound like WoW pvp fans would probably be highly competetive, but this is not the case. Blizzard's latest ladder matches, "Rated Battlegrounds," are never praised. Arenas are primarily discussed in reference to 2v2 teams, not 3v3 or 5v5, and mainly for acquiring gear. Regular BGs and world pvp seem to be the biggest hits, even if they aren't rated and provide no reward other than killing another player (though oddly enough, some people enjoy talking to their enemies afterwards, which is diffuclt in WoW due to langauge barriers preventing the two side from communicating, forcing players to create a character of the opposite faction to speak with their victims).
Essentially, it sounds as if WoW pvpers kill for the sake of killing. Most prefer very small scale battles or being randomly grouped with others and just being able to jump into things, similar to FPS players who don't play competitively. They do not seem to want highly organized matches on competitive levels, which makes me wonder if, perhaps, some would prefer a game like Rift, where there is currently no competitive ladder matches, just grinds and world pvp targets that give small rewards. In addition, other games also allow you to speak with your enemies, such as in Darkfall or Asheron's Call, though dropping loot on death in those games may also scare them away.