Space Empires III
Starship Troopers (not the FPS, the MMO 2D space combat game that probably none of you played)
Diablo
Everquest
Mechwarrior II
I didn't get a PC until late in the 90s, so I missed a lot. But Final Fantasy II for the Super Nintendo was a life-changing event for me. I also played the heck out of the Wing Commander and Tecmo Super Bowl games on SNES. On Genesis, I played a LOT of Shadowrun.