Uninstalled it yesterday to make way for better games in my possession. Needless to say I'm quite disappointed by it. My problems with it:
1) The atmosphere was pretty bad. I couldn't immerse myself properly into the game.
2) I can't access MP.
3) The stealth (my favourite style of play) is horrible. The AI reacts completely illogically. If they come into a range of maybe 5 meters they suddenly gain super senses and can detect a stealthed soldier crouching in the shadows.