First of all, it's a very nice mod. Very detailed, but...
1. It's only possible to play Roma. (Sure, for me, it's also possible activate all civ with the editor.)
2. And here I see your bad balanced settings: Try to play Epirotes. The Epirotes don't have any chance to win against Rome - historically unaccurate -, because they're unable to build units (in your mod). - ! - The Epirotes don't have only one (and not Roma) diplomatic contact.
3. In your mod, I find sometimes units of other nations somewhere else and bad placed.
4. The AI is important, because it's your opponent. And the AI is in your mod bad balanced. Your suggestion to only play with Roma don't show, that my roman opponents are underpowered and Roma is overpowered.
5. Research: The Romans has 275BC nice military and troop researchment, but it's unrealistic to build an detailed tech tree only for the Roma. In long games other nations don't have a chance against a human Roma.
6. Graphics - ! -: Your terrain and some units looks very weird. Look here:
http://www.civforum.de/attachment.php?attachmentid=24117 (
http://www.civforum.de/showthread.php?t=10789)
7. Ports: Blockading ports is impossible in Civ, or unnecessary. Why you don't use port-resources in water, which get you a +20 or +30 trade, so when you blockade it, the empire lost much money? Instead of this, you have to reduce many other trade-bonuses of other resources.
8. Shipyard: Maybe an shipyard-resource for ship building?
9. Historical infos: Athenae was at 275BC very weakly; Athenae was some years ago at control of Macedonia. Sparta, Athenae were not strong enough as in your mod - and sure not allied.
10. AI Roma: Use Militaristic and Expansionistic
11. Germania: German territory is maybe too large. Look at some "Rome:Total War" Mods:
www.twcenter.net