After 10 or more games on 3000BC start, it is definite that old civs needs to be toned down. In 9/10 games Greece, Rome, Persia survived long after they should be gone (half of the time Persia survives till Seljuks attack). Once, or twice out of ten is OK, but this is kinda too much. Also China is teching too fast, and given their stability (I've never seen them colapse or have a crisis), they became monster around middle-age. And poor Mongolia on 3000BC never had a chance... they do great on 600AD though.
Also, why there is no more Yerushalem on 3000BC start. Temple of Solomon is moved to Babyl... Doesn't make senes. Also, shouldn't Christianity be founded automaticaly around 0AD, if nobody finds it earlier? I tried several Byzantine starts on 3000BC, and only once or twice seen christianity founded (in Delphi-Greece, and Babyl-Persia), otherwise zoroastrianism was main religion (even in Greece?). And byzantines spawns at 330AD, by then Christianity should be there...