Really good, gave a very real feeling and gave a lot of variations.
I really liked the stealt missions like taking out a military base in the snowstorm. The choice of weapons was good but I would have liked to know more about the weapons, compare the stats about 2 weapons.
The mission in Brazil was bad, you had to fight hundreds of enemies who seemed to know where you are even with their back to you.
What made the game really good was the graphics. No problem with draw distance and extinguishing enemies from the background.
What I liked was the granade danger indicator but throwing back the granade was difficult at times.
Teamwork could have been better, the team worked on its own so you had a free role but that also ment you had nno backup if you weren't with the team.