Well for the relative approach I agree with the original poster that IF we had a Mp campaign then the Greek cities would be hard to play...
But with the current dump AI they are very easy on turn one blitz Messana armies by the time that the Roman reinforcement arrives you have dealt with the primary army and the second army has nowhere to retreate, after that sally a siege by the Carthage wich will be their doom, blitz at the same time Corinth where your spy will open the gates for you, and Athens on the same turn, with Rhodes and Zeus wonders plus if you blitz the cut off Sardis Seleucids and Hallicarnassus on the way you get 4 wonders thats a LOT of cash...=victory!
As for the rest the Parthians are VERY hard with the cloning rebels which pop out of nowhere and the nature of the wide spread lands but if you displace the Seleucids after that the HA Cat combo rules, same for Armenia though they have access to the Black sea, Scythia is simply Impossible with 1.2 if you dont migrate to the south abandoning all the useless landmass, Spain Thrace Dacia have pretty much the same dificulty with Thrace having the advantage of access to the south Balkan cashcow of Greece, The Germans are strong if you have the mental strenght to deal with the cloning rebels same for the Gaul and the British, as for the Carthagininas if you take Sicily the game is over, Ive modded the "egyptians"---vomit smilie--- to a more mature version from the previous Hollywood crap product of someones sick imagination so I cant comment on them, the Seleucids are similar to the Greeks if you blitz middle east youve done for the rest of the game...

Hellenes