I agree with Renata that our city placement wasn't good. In AW games you ideally want the first 4-5 cities to be able to mutually support each other, chaining like Own suggests isn't good enough. I would even go for 2 tile spacing if needed.
Yesterday I played a little test game (60 turns) as Carthage. Started on coast, with nearby rivers, and got BW and Masonry after ~60 turns (~25 for BW, ~35 for Mas IIRC), but the river was very helpful here. GA is indeed triggered early and so pretty useless. Food is a problem - no granary and no food bonus, I had only 3 cities after 60 turns. Mercs are good but not better than the cheap hoplites, you're not going to attack with these guys. Seafaring is fairly useless, I don't think we really want to send out curraghs to find friends. Set water to 60% and there was a lot of room, I had only one opponent (Maya) so survived the first 60 easily. I think 70% water is better, AW on one civ isn't much fun. Barbs were set to random, but we probably don't want them - goody huts hardly give us something good on this level.
I like the idea of each of us playing a start. I will try Rome on 70% water, no barbs, but I'm hoping that someone picks up Germany and perhaps Carthage, they're interesting choices I think. I've also been thinking about Ottomans, not much help early on but might be interesting in the come-back phase.