I played
Superpower. At first, I thought it was really cool. You could develop technologies, make treaties, and even pre-target your nuclear arsenal. Watch out for China, biatch!.
Then it came tumbling down. In one game, the Ukraine invaded the Middle East, sparking World War III. On multiple occassions, the United States turned into a dictatorship (all you need is enough money and you can change your government), leaving me (the UK) all alone as the world fell apart. The really dumb part is you can never tell why war occurred because the event log after each turn was almost impossible to navigate and took 10 minutes to read completely.
Oh yeah: the game crashed every five minutes. It made HOI 1.0 seem like a fully-developed game.
Conquering countries was rediculous. All you had to do was conquer their major cities. That's right, Canada could conquer the U.S. within weeks of an invasion! I could never understand how combat worked, so I let the computer do it for me. Whether I actually took a city or what damages my forces took were impossible to figure out.
I finally sold the game on eBay after it sat around my house for three years.
All in all,
Superpower was crap. Fantastic premise, but utterly shitty production.