My first game in civ 6 was on king, China, continents, standard. I just went tall, seeing IF it is still valuable, i had 3 Core cities and ended the game with just 6 cities in total. I won both science and culture with it.
But i was always second in Score. Peter was on the other continent, absorbed 3 city states and got 2 or 3 cities from Gorgo, founded 4-6 by himself, not sure anymore. The third ai on his continent was arabia, just having ONE or two cities. He was a beast in getting great people, ALL those writers, artists and musicians were hard to get, but luckily he didnt build a lot of ts and i got enough great people to get mine filled.
The general problem of this game is not, that the ai is generally bad, it can be good, but it seems, that sometimes those leaders are Beasts, sometime just brian dead. (Yeah, doesnt really count combat, with archers in a fortified position with the help of some melee, anti cav and obviously cav yourself, you just have to shred their units).