Interesting game, definitely worth to play.
Advise: Before start the mission, you have to select the suitable weapons in order to gain smoothly; If not, you will have hard time to complete the mission. (Snippers are essential and you need plenty of spare bullets too!)
The only complain on this game is very limited camera view, sometime may have difficultly to move(control) the team; You also have to memorize which buttons(shortcut) to control certain combat for special roles.
Overall experience is enjoyable, some mission will spend you an hour to complete, you need to be patient, good strategy.