I've been playing on and off for months. I really like it but it doesn't have replay value yet. PvE is fun but limited, and while I've never been a PvP'er, I didn't like the arena matches.
They have made massive changes over prior months which is a double edged sword. It means they're changing/fixing things, but if there isn't a fixed direction, when is it going to be "done"? Motorbike races anyone?