Master of Orion
I used to love Masters of Orion II; I would play as the Psilons, get a ridiculous technological advantage, and produce massive death-star like Dreadnought ships that could vaporize any target or planet in one mega-beam.The game had a flaw, though. The AI opponents would mass up hundreds of zergling-like very weak ships, and they would EACH get a turn in combat. So my 4 dreadnoughts would wipe 4 of their ships, then 296 enemies would fire individually and miss onto my mega-shields...then they'd be down to 292 after my turn...then 292 misses...and I'd leave the game for 3 hours until the battle finished.