I'm a big fan of role-playing games (RPGs) so any MMO that has more to it than just hack-n-slash = thumbs-up for me. Minigames, professions (i.e. cooking, wood-cutting, tailoring, etc.), fishing, free housing, and useful pets are all big pluses in my book. I also play first-person shooters (FPSs) when I feel like it (my friends like to target me for an ego boost).