I've been playing CSS for about 17 years now, sure i stopped playing many time but i've always came back. I have played many first person shooter games and css always stayed my favorite of them all, i even tried CS:GO wich was a big dissapointment for me. Css is just simple and fun it doesnt require to have a good computer so it's available to more players, i also enjoy games that doesnt have too many plants/trees/herbs laying around everywhere! even after all these years the game is as fun as it was when i 1st played it.
Also if you have played any recent shooter games, in the last 10 years, you probably noticed that most of them are dying after a couple of years or they stop getting supported.. it just leads to alot of bug users or hackers ruining the fun for everyone, yes CSS has hackers and bug users too but atleast there's still mods taking care of them.. I quitted an fps game that i was ranked 4th in the NA rankings, i really enjoyed the game but i left because there were too many hackers on it and the mods didnt care about making the game fair aslong as people would still buy stuff from the store.