CSS seems to be too popular then, if everyone knows all the hacks etc.
I played CS for like three days and that was it, I just didn't like it. Didn't like the speed of it, didn't like the atmosphere and I always had to close it when my mother entered my room, because you know it has a bad reputation.
That's why I stick to Chrome from Techland for years. I play it usually with a friend of mine. Since we are both actually pretty good at it we get called cheaters sometimes but that's no problem because you always find someone who is close to your level or even better than you.
I'm generally not that into online gaming, I'm more a fan of lan games/private servers, like when I played minecraft with friends or when I play Diablo II with friends.