Thoughts:
1) If bonuses don't carry over through the ages, I see some of them being not overly useful. For example, the egyptian bonus of +2 to food during the ancient age. What happens if you move into the classical age and now your cities become stagnant or worse, enter starvation mode due to lack of food? I imagnie it won't effect every game, but should have an impact, espically on arid maps
2) Factories providing 3x more production seems a tad over the top. Guess it's good if you like fighting later wars though. If your fighting america though you better take it out early.
3)What wonder does egypt start with? Do you get to pick and choose?
4) If not every civ has unique units, and unique units don't provide any bonuses over normal units...whats the point in having unique units excatly?
5) American Great person randomly chosen? Or do you get to pick and choose? Seems pretty powerful.