The anti-thesis of dungeons, Battlegrounds offer a completely different experience to players. Dungeons are completed by calculated, methodical progression; the goal being to control the game rather than letting the game control you.
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PvP is quite the opposite. In PvP battlegrounds, you are not pitted against digital entities with calculated behaviors, but fellow humans with all the common sense and lack there-of that comes with being human. PvP rewards quick thinking and situational awareness: the moment you think everything is safe and good, a rogue will appear behind you and you'll have the choice of releasing your spirit now or in 6 minutes.