I enjoyed building the long-range missle system and watching the projectile eliminate clusters of enemy dots on the radar.
Some other RTS games that I remember:
Dominus (dos): Anyone remember it?
C&C, StarCraft, Red Alert 2, WarCraft 3: they were fun for a very short time
BattleZone 2: I think this might be a classic now.
Total Annihilation Kingdoms: awful
Force 21: could have been so much more.
Star Wars Galactic Battlegrounds: haven't had time
A good mechanized armor RTS with modern graphics would be nice, like Force 21, but deeper, more detailed, and less flawed.
I feel like playing TA right now, but...everything takes so long to build in that game. NBA Live 2003 is a nicer, faster tempo for current gameplay.