The game is really awesome. Lots of cool little secrets and nods to past franchises. However, I must say that while the online mode is fun, and nearly flawless, when it lags, it usually dies. All stuff you got in a level is not saved, so you basically have to restart to get the stuff you lost back. So disappointing, but not a major detractor. But the kicking while online is.
I'm level 21, have 5 of the achievements (and 2 towards K.I.S.S.). I also got to see the revival mini-game in action. Basically, it's kinda like...those NBA games where you shoot free throws. You gotta line it up, but you still revive them. But the closer you are to the center, the more health you regenerate.