It's better than Counter Strike 1.6 and it has more to offer.

I like the gameplay, the physics for the game make it harder to do things. It takes a lot of other skills to get use to.
The graphics are more realistic than the ones before.
You can pick nades now. The sound of the guns and the sound of the explotion are nicer. The whole game is more realistic. When you get hit in the head, it makes a sound.
Running a higher graphics card and running on high setting makes the game faster and better to play.
Games like theses and playing with a wireless mouse is hard. After upgrading to the G5 mouse, it is a lot better. The sensivity on the mouse is higher, it was harder to adjust.