Simply one of the best, most detailed RTS games of its time. Much more complexity and depth than Starcraft, however without the swarm of followers.
Innovative 3d engine, using real time rendered polygon units, not sprites. Absolutely the hardest missions I have every played, while still being 100% enjoyable. I recall the first Lava map by the core, that battle took over 7 hours of slogging back and forth with an AI that finished all its map scripts, then adopted the standard AI. Every inch of terrain was hard fought, made even more difficult by the missions low tech level.
The graphics are dated compared to today's games, the lighting effects we enjoy today were simply not possible back then.
Place yourself in the gaming and graphics mindset of 1997, and you will not be disappointed.