I come back after a short hiatus from Civ to this thread, and I'm really confused why this forum in particular is so allergic to metagame discussion. Why do guys hate subjective rankings of Civs so much? It's a good way to facilitate discussion about the strengths and weaknesses of various Civs and it's a way to discuss what you perceive to be the metagame—what you perceive to be the best strategies in the game.
Probably the talk about bugs being taken seriously, and also ranking based on a city state that isn't guaranteed to spawn next to you. As someone who has Civ has one of the few games I don't play competitively, I find that really off putting.
Though I guess you can still account for it. For example, if you think that city state boosts that civ by 500 points but only 1/10 games you would see that happen, then it should be 50. I dunno.
I love tier lists myself, but you have to realize even if every civ was almost as good as each other, someone has to be at the bottom and that rubs off poorly on some folks.
Given that China has probably one of the worst UU's in Civ 6, and that they have no bonuses towards Domination, I really can't see China as a Diplo-mination Civilization. Hungary is certainly a valid choice due to the Envoys you get from levying City-State Units.
China has the easiest time building the Mahabodhi Temple.
China's UU is weak, but UUs are only a small part of the equation unless early, and the crouching tiger does boost city defense greatly. Because the Medieval era (only topped by Renaissance due to the weakness of siege and huge increase in wall strength) is one of the worst eras to war in it makes sense to turtle up in that era after consolidating conquests in earlier eras while teching up and such.
Also China's builders have +1 charge, making chopping early armies more effective, and eurekas are also more effective. Sure, Babylon is better, but Babylon is also stupid.
They can also build war wonders cost effectively, like Teracotta and that otherwise meme Statue of Zeus.
But it's probably just the Mahabodhi