Damn this game is amazing, from the graphics and sound, to the gameplay. On hardcore difficulty the enemy AI is very smart, and will dive behind cover at any chance given, or even try to flank you while you're under cover. Really keeps you on your toes too, since they can come busting through doors, outta emergence holes, and lots of other things. And the multiplayer is just as tense. You really have to work together as a team and get a plan together to win. Oh and the co-op play is really fun, especially when you have to go down seperate paths to complete one objective, helping each other out as you go.