[Potatoman]

Jomon with the ninja is pretty nice. And by nice I mean totally awesome. *cough* realultimatepower *cough*.
My favorite faction is probably Time of the Aboleths Ry'leh, or EA Tien Chi though.

Spring & Autumn Tien Chi seems to be a powerhouse EA with their awesome sacred warriors, great bowmen and trampling nobles with great stats.

Time of the Aboleths, on the other hand, seems about as weak as you can get, despite the entertaining theme. Their two enormous problems are that 1) none of your decent commanders can leave the sea and 2) none of your troops that can leave the sea have morale higher than 8.
Oh, and none of your mages have the paths to cast any amphibious summons or forge amulets of the fish.
I do imagine they trounce Atlantis & Oceania rather badly though.