1100-1200: Pretty noob plays, always loses, except VS other noobs like him.
1300-1400: Can win if he really, really tries to, but still pretty noob.
1500-1600: Yeah, he is still a noob alright. Will lose a lot of 1v1 games, but win some 4v4s.
1700-1800: Finally starts winning some games, but it's still considered a noob by peers.
1800-2000+: A good player, someone who can be considered regular in 4v4s.
2000+: A literal God of 0 A.D., probably played the game since A17.
As you can see, there is a fine line between being good and being a God here