This game started really badly for me, and didn't improve throughout the ancient age. The most noticeable problem was my warriors' inability to defeat barbarians, but that shouldn't sway a game - the real issue here was my aimless wandering through the tech tree, the complete absence of a long-term plan. My basic theory was to ignore the slingshot and concentrate on Ironworking. I saw that there were plenty of literate civs, so didn't expect to make Philosophy first - reading other people's spoilers, I see that this was dead wrong.
As for the top branch of the tech tree, I expected to start next to Rome (becasue the Celts description said so!) from whom I could get Bronze. Thus I started research with Wheel. In 2900bc I got Wheel, and had guessed that contact wouldn't be as easy to come by as I had expected. Unable to meet Rome, I started researching Bronze, which arrived in 2350bc. By now I knew I was on an island, so started Alphabet for curraghs. In 1910bc I got Alphabet and finally started Ironwork.
By this point, the barbs have already started swarming, and my empire's production is completely redirected towards producing axes to keep the barbs away from my towns - by the end of the QSC I will have lost 11 axes and a curragh to the barbs. My towns were pillaged twice, and it was only with the arrival of gallics that I could get these vermin under control, but I didn't start building them early enough, stubbornly trying to build axes for upgrading.
My first curragh was built the turn after I got Alphabet, and just managed to reach Persian borders in 1750bc, before being sunk by a pirate. My meeting with the X Man was a mixed success - I traded for Mysticsm okay, but then accidentally gave him Pottery + 7gpt + 76g for War Code. Bad deal. The next turn, I could shout across the sea to the Romans in Pompeii. I traded for Ironwork, finding that I had two sources of the precious metal. With my economy reeling from the Persian deal, I started minimum research on Polytheism.
I got another curragh out later, and met Shaka in 1200bc, with Alex joining my circle of friends in 1175bc. This gave me a good broker's position, as most of the AI didn't know each other. I traded techs around wherever I could find some profit, but this just meant that the tech was outpacing the barb-supressed production capacity of my empire. With my first gallic upgrade only done in 1050bc, I wasn't in any position to go to war in the ancient age, and the AI were just getting stronger while I floundered about.
QSC Stats
10 towns with 28 citizens and 107 tiles.
3 granaries, 1 temple, 2 barracks, 1 wall.
97 food in the bin, 161 shields in the box, 88 gold in the treasury.
2 settlers, 9 workers, 3 warriors (1 vet), 2 gallics (1 vet), 1 curragh.
4 contacts, 4 embassies.
All first and second tier techs, Mapping, Riding, ~29 beakers of Polytheism.
QSC score 3492 - this would be good for many games, but not this one. Food is so easy to come by for an agricultural civ that I expect some really huge QSC scores for the Celts.
In the first millenium bc, the AI started extorting tech and cash from me. As an island nation, I shouldn't have been afraid of them, but my mood was so bleak that I paid up. Late in the ancient age, Caesar founded a town on my western peninsula. Inspired by his example, I squeezed a settlement onto the Zulu continent, on their western coast. I still hadn't decided who I should be thinking of attacking first, when, in 390bc, a brisk round of trading brought Greece, Rome, Persia and myself into the medieval era. I was still a despot.