Multiplayer for the win.
Aces High, air warrior, and warbirds are great but I had a lot of fun playing multiplayer Doom, Duke, Mech Warrior, and shadow warrior.
I just pulled my old doom server pentium machine out of storage with 4 modems in it and it still works.
I plugged in a midi controller and used the awe32 with 32 megs of onboard sample ram as a hardware synth. that has zero latency.
Try that with a software synth.