I second Total Annihilation.
The only way you would know its'old by knowing the date or watching the graphics.
(not so with the cutscenes!)
Far as I'm concerned this game is still 'ahead of its time'
SFX were absolutely great, but not as fantastic as the music
Basically it was red book, so no real fancy interactive system, apart from crossfading songs with different moods when battle situations changed.
Worked good though.
+/- 8 live orchestral tracks, still some of my favourites works today.
Fantastic gameplay btw.
Also, this game was AFAIK one of the first games with complete live orchestral scores. (1997) It totally blew my mind.
You 'should' watch (& listen to) some clips;
Site with movie clips