I've been a PC gamer for about a quarter century, and only three games ever truly captured my attention:
-NetHack (ASCII Roguelike)
-Battlezone
-cRPG (mod for Mount & Blade Warband)
Battlezone's graphics were astounding for the time, and it melded action and realtime strategy elements like no other game before or since. The AI was atrocious, but at least in multiplayer it was equally atrocious for both you and your opponent (half the fun was tricking the enemy AI ships into getting stuck on terrain and taking themselves out of the fight).