A+ombomb
Actuary
UUs are no doubt very powerful in their time, but in multiplayer it isn't always feasible to make it to that time. Therefore, I would propose that each nation have a larger array of UUs than just one, perhaps one for every age. In this way, every race could be at least somewhat usable during all ages (for multiplayer more than anything, which requires some semblance of balance which is certainly lacking for a nation like germany or america in particular, who each have very late game UUs).