I was never into CS much, I only got into it around when Condition Zero came out. I've always found it fun, but never got into it competitively or even played with people all that much. It's been a strictly casual experience for me.
But, I really like this new version. It feels... modernized, while sticking to its roots. Thanks to it, I no longer need to purchase Call of Duty or Battlefield, because Global Offensive fulfills the purpose I'd have used them for - a fun little modern wahey shooty, with none of those rubbish ranks, upgrades etc.
That's really the formula that's worked for CS all these years: "Here are some guns, there are some enemies."
That said, stoked as hell to see Arms Race put in as an official game mode. I don't know why but I find it to be ridiculously fun, and I excel at it more than classic game modes.