Everyone remembers the times when almost everyone did not have access to the Internet and sat in computer clubs, networked to play with friends. So here it is. CS:GO is not an improved version. This is something different. Shooting, physics and generally everything in this game is different from 1.6, source. The only similarity will be the number of weapons, and that’s probably all. Many people criticize this game, saying it's not optimized and that's it. But this is all nonsense. The game will suck you in and you won't even notice it. My only advice is to be mindful of your privacy and remember that it's just a game. After all, games are meant to make you relax, not make you nervous. :D
The game is very good, there are the good old cards: Dust 1/2, Mirage, Inferno... And new, modified cards that you can download in the Steam workshop.