Lessee...
I had F-19, Silent Service II, M1 Tank Platoon (and haven't found another tank sim I liked since), Civilization, Covert Action (not a big hit, but I had a blast with it), Masters of Orion, Masters of Magic, etc.
Owned Fleet Defender and to this day I haven't found a flight sim I liked as much. MPS games had the best 'immersion', the best 'fantasy life' quality I've experienced short of the Sims, right down to naming all your pilot buddies after your friends.