I started playing CS when it was still CS 1.2 (mid '01) and never updated afterwards until CS 1.6 came out because CS 1.3 came out the day after 9/11 and, as I in the military, we got very busy in the Middle East until post Gulf War 2 (mid '03) which was when CS 1.6 was released and we got about 1/2 a year of "downtime" where I could catch-up with PC gaming. Well, until Afghan started to brew up again.
I never liked CSS initially and hated CS:GO even more but by now I quite like CSS and even CS:GO is starting to appeal to me more but my "old man" eyes & reaction times, now I'm starting to approach 50, means I'll never be "good" at anything other than a quick few rounds with friends.