I played this game years ago and now I needed to freshen up my memories replaying it. The game lets you control you two-member team. You have to fight terror and you have to use your brain to put down the plot. At times the game can be punishing. If you don't find cover when under fire, then you'll simply drop.
There are some points you can earn by accomplishing different actions. These points and actions can help you unlocking new gear and weapons.
The game is enjoyable. Play it if you like Rainbow Six series.