Why CS:GO is the best multiplayer shooter out there

I picked up Counter-Strike: Global Offensive last week. I don't know why it took me so long—the game came out in August, after all, and it costs only $15. Anyway, I was playing Battlefield 3 with a buddy of mine, and we were both getting slaughtered by a whole team's worth of veterans—you know, those folks with the golden eagles next to their names and every unlock in their arsenals. I mentioned CS:GO in passing, and my friend asked, "Why aren't we playing that right now?"