I know this is pretty old, but I thought I'd share my thoughts. Its a fun game, love climbing all around and stuff. It is pretty confusing on where to go though. I feel like its more of a single player game than multilayer. The graphics are great. I ended up uninstalling though since it was getting close to 20gb of hard drive space.
Me and my sisters love this game. My sister is like level 46 and has a super cool avatar thing. She plays it more than I do and loves it a ton. Her name is LiveInferno. I'm Shock Wing. Pretty cool game.