I played the original Civ to death but the next one was while I had no computer at Uni so I never really got more than a few plays on it.
Because I’d got so good at Civ I didn’t like having to relearn all the tactics and stupidly never really continued with the series.
I was a massive fan of starting as Russia or the Romans on the standard Earth map and trying to kill everyone and win the game before 1AD.