This week, I gave World of Warcraft's player-vs.-player (PvP) combat a shot. I was expecting to find it fiddly, even boring. After all, there's a reason that so few RPGs include competitive multiplayer: When your character's strength is determined more by level and equipment than by your own skill, and when the combat has more to do with strategy than with action, it's not much fun to face off against friends or strangers.
Instead, I found PvP to be complex, deep, and surprisingly action-packed. It's still a little too overwhelming for me to enjoy it that much, but I understand why so many players think it's so rewarding.