i play this quite a bit, as most of my friends have it.
i can't stand the game if i play by myself (unless i'm trapping as a commando or griefing), but rolling servers with a pack of friends is pretty fun. the game could really benefit from some voice chat.
i hate HATE HATE the rpg aspect of it, or rather, how it is implemented. I've got three characters around level 15 and at even these levels, leveling takes forever, and when you're working towards those odd numbered levels, you lose motivation very quickly since you will be getting squat.