i just finished it today, very very short but still a cracking game.
I agree with lemonjon about the AI's, they do get in the way and then you get fooked for friendly fire
I liked the end mission aboard the airplane and now have unlocked some cheats( not really cheats just different screen colours etc ie B&W and high contrast)
Ive not been on the multiplayer yet but again as Lemonjon said that side of it is suppose to be awesome.
Mercs was a brilliant game as I did a thread about it in here before, hope they do a new one for the 360
