In the Counter-Strike-series you (normally) play rounds and if you get fragged you have to wait until next round, which can take minutes. This differs from many other fps-games where you re-spawn after a couple of seconds.
The matchmaking system is great creating competitive games 5 vs 5 players.
You play best of 30 rounds, after 15 rounds you switch sides which makes CS GO balanced.
Very affordable.
Graphics are nice but not too demanding.
Controls are perfect.
Steam is great.
Counter-Strike: Global Offensive is the best fps-game.