I've only just started the game proper, but from just the tutorial and prologue sections I feel like I've played 2 or 4 different games. This might be the most masturbatory game I've played, but it's also pretty cool so far. I'm glad they decided to not just repeat everything they did in the first game, play/narrative-wise, though there is quite a bit of frontloaded repetition, etc. The demo was a good taste of some things, but definitely not everything the game has to offer, even in the first couple hours.
