Well, I have been playing it for a while and I'm probably not going to play more. There are some really annoying glitches which make it kinda annoying to play. Light effects are bugged if I play in full screen (like constant flickering which really hurts your eyes) and sometimes sound gets bugged, voice acting disappearing and sound effects playing way too loudly and incorrectly (hard to explain this). Game also crashes sometimes whenever there's a loading point which makes playing it even more annoying.
The game itself is very promising though. It's much more linear than Crysis was and I mean that in a good way. My main issue with Crysis was that it lacked focus and while it was fun to play the way you want to it was still ultimately always about getting from point a to point b which made those huge levels mostly pretty pointless. Crysis 2 also has the same basic concept that you can approach any situation either by just going in guns blazing or by being stealthy. But the way the game plays feels more like Half-Life 2 than Crysis and that's a good thing, it just feels more streamlined and focused. Using suit has been simplified as well, this time you only turn on/off stealth or armor and there's no mode for speed or power. You simply have to sprint to use your speed ability and you'll use power ability whenever you do any of the power moves like hold space to jump really high or kick cars with the action button or other stuff like that. It's really nice because now you don't have to constantly be switching your suit mode and you'll still be able to do all the things you could before.
Another thing I really like is that this time there's a melee stealth kill which is a nice addition because in some of the bigger areas being noticed means taking on waves of enemies and it can be pretty tough on the higher difficulty settings. Although I can't say it's as much fun to sneak up on enemies and kill them as in MGS or Uncharted 2 since stealth mode makes it a bit too easy, it's still fun.
On the downside, I feel the environment isn't nearly as interactive anymore, perhaps it has something to do with the engine being reworked so that consoles can handle the game as well. I tried to shoot down some trees and branches and they wouldn't break or fall down. You can still interact with most of the smaller objects but I don't get the same interactive feeling as I did in Crysis. Of course it's also partly because of the fact that Crysis 2 takes place in urban setting instead of a jungle with small destroyable huts and stuff like that. Another thing is that I have come across a few vehichles and I couldn't drive any of them. It would've been pretty much impossible to actually do anything with them in middle of the city levels I played but it just felt weird since you could use any vehichle you wanted before.
I partly feel it's been downgraded from Crysis and Crysis Warhead but it still looks and feels fantastic. But I really like the more streamlined approach and if Crysis Warhead was any indication which direction Crysis is going, I think I'm going to like Crysis 2 a lot. But yeah, until someone manages to fix some of those more or less game breaking bugs, I'm gonna wait for the retail version.