Actually useful - will help me decide if I am getting it to play, or just to add to my Civ collection.
__________________
Solver, WePlayCiv Co-Administrator
Contact: solver-at-weplayciv-dot-com I can kill you whenever I please... but not today. - The Cigarette Smoking Man
I'm not sure how useful the demo is if Civ3 is required to play it, but its an improvement nonetheless. Of course, companies are much more likely to have demos for decent games than crap. [cough] MoO3 [\cough]
Well, if you need it, just make sure you play as a civ with an early Unique Unit, eg the Inca, Mayans, Iroquois, Hittites, Sumerians, even Byzantines...
That way you at least get to see what a Golden Age is...