Guild Wars I played in their open E3 and Halloween events; it might be what your looking for. GW is geared towards alot of PvP, but also has cooperative and solo misions where you kill monsters, level up and get your loot. Ideal for the casual player is the start up time; I could be killing monsters or other players with in 2 minutes of starting the game.
I had a blast in the arena; grouping is done automatically so all you have to do is click fight and your off to a private area for team battle. It's as close to swords and magic, death-match style gaming I've come across
