It's actually the first game I've played/bought in a damn long while and I have to say it's fun as hell. It's also quite astounding that the things that are currently featured in the game are only a tad of what's going to happen and actually just point into the direction the game is going to pursue.
Yet, with the current state of development, I couldn't imagine playing it for a too long time in singleplayer. However further updates (quests, storyline,...) will most likely change that.
To answer your questions: Obviously; Bought it with a few friends one day ago; Warrior/8; NOP