The only game where you feel like your fighting in a big city.
The graffix of the city (mainly Juarez) is presented more realistically. Its not bright but dusty and in the desesrts, you get a sense of heat and sand and the sound is great, the guns are amazing to shoot. Throwing a grenade is something special and you will probably have to turn the sound down.
The game takes a 3rd person view, but it is close to the shoulder so you still get a first person shooter feel and it works well with the abilty to take cover.
The negative sides of the game are that is it a bit too short, but the levels are immersive and different. Also, your team isnt that effective and are frankly rubbish at aiming (except the sniper), and some team mates like the AT gunner are a bit useless considering that coming across a tank or helicopter is only a small part of a level that contains them.
The diffuculty is just right, but if you have got used to the game, you will find the hardest difficulty (one shot and you're dead) quite easy, thanks to the ability to take cover.
Ghost recon advanced warfighter 2 is a great game, especially if you are bored of the convensional first person shooter, but dont want a real sim like Operation Flashpoint or Arma.