MOO2 is easily the game I've played most over the years. Now and then I'll just remember it, and play again...
I've been playing it since 96, and it doesn't get old. Sure, the graphics and sounds are sub-standard, but the gameplay is still plenty of fun.
I've played many of the newer 4x games, but never found one I liked as much.
Too bad they changed it so much they destroyed all the fun in MOO3!