I've had some of my best gaming experiences with this game. This long, brain-burning game.
Played a 2 player game, and was cruising to an easy victory. Started to suspect my opponent had a nuke, but, I wasn't worried, as I figured I could shrug off losing a city. So when he hit me with 2 (TWO) nukes, with one city left and his army bearing down, it got scary real fast. Barely one, but it was an amazing game to play.
Another game was a 4 player game with the Russian player just building one city. We felt sorry for him all game until he started stealing enough tech to eck out a tech victory that the rest of us didn't see coming until it was too late. Great game.