My experience:
1100-1200 players: I can win against them. Most of them are slow and have a disastrous micro. Some are just fake rated, and most of them quit without resigning. But I know good players at this level.
1300 players: I'm probably able to beat them, with hard fights, they usually play TGs (like me), which make them way better in growing a city and a army.
1400, 1500: never played 1v1 against them, but it's a very variable rating. I saw some 1400 players which are worse than 1300 or 1250 players (the same for 1500 players), probably of a "rating farm" (winning only against 1100-1200).
I'll end this part here. I'm not considering rushes because I think they turn any of these ratings into mere decoration.
1600 players: they are strong, and can easily destroy me lol
1700+: the same as 1600
Just a note: I'm between 1200 and 1300 (by the time, I'm 1300 at lobby), and this is just my experience. Rushes can kill me easily.
I think this is the best way to understand these rating levels.
Final: The problem are, as I said, the "rating farmers" - they host games that are only in their side, using maps that they can play without even watching (blind) - but, anyways, they don't play TGs and they don't pass the 1600 rating.
That's is a truth, as 0 A.D. lobby is not a lichess.org lol