Two of my favorites are The Ancient Art of War at Sea which I was never able to run on my pc because I only had MCGA, and even with my CGA emulator it was not enough.
The other was Nightmare on Elm Street: Dream Warriors. This game really cemented my love for the Elm Street franchise.
Because of the mcga issue, my most played games were ascii games like Hack, Larn, DND, Mines of Moria.