meh, I was glued to the game for the first 6 days I played. Then some of gameplay mechanics/flaws started to really stink up the place.
Im alright with the whole real-time building, but when people can just waltz into my camp and steal resources, that pissed me off. Hours of passed time(on or offline), down the tube in 2 minutes. I know it's in beta, but that is just ridiculous. And the defense/guards are pretty poor.
Even though I respect the bold choices they made for this one(some very awesome), I believe the MMO portion shat on the fun a little. At the least, you should be able to play offline mode.