The single player is great so far, I'm on a boat right now rescuing hostages. There's a nice risk/reward element with the stealth stuff, but you can just go in like rambo if ya want. Essentially, you can sneak around and subdue guards or plug them full of holes before a patrol comes by. If anyone hears you firing an unsilenced weapon, or sees you or an enemy in his death animation- reinforcements are coming. The AI continues to impress. Leaning, peeking, diving for cover, advancing with cover, occassional flanking, blind firing, blindfiring while hauling ass around a corner. Overall this and cool things like destructible cover really elevate the game. Although there's a hilariously bad way they try to make a crowd in a nightclub. Its so corny but awesome. I have a bad feeling the game is going to end soon though.
Multiplayer is a really mixed bag. There's some fun to be had here, mostly shotguns on Archives (small map) but the framerate takes a hit and the result is controls aren't as smooth as I would like, although doable. They implemented a perk system with leveling up ala CoD, which is taking FOREVER and I really hate how every shooter these days won't give me all the toys in the toybox right away. I also suspect people are using their sniper rifles like shotguns much of the time. Spawning is instantaneous which causes these stupid trains of people shooting each other in the back on modes like Golden Gun. Haven't had a chance to try local yet, probably around thanksgiving.