Celtic fans like to hate on their players.
I actually think Boston Fans tend to overrate our players. The rest of league knew that Sullinger gassed and a lost cause before many here did. People always think that our free agents are going to command a lot more than they do. Haven't you ever seen some of the lop-sided trades that are proposed here? Or the talk about Yabusele being the next Draymond Green. So I clearly think that the opposite is true.
This is nonsense. All fans of teams rate their players higher than players on other teams. It's called bias. I am sure Magic fans think Elfrid Peyton's hair looks good.
As for Rozier, he is a 23-year old on a rookie deal who at this time is a plus defender and elite rebounder for a PG. His shooting is not good enough and he is not a creator. The question is: will those deficiencies improve? If you are a fan of his, you are betting yes. If you are not, you are betting no. That simple.
I think most Celtics fans are of course fans of Rozier and therefore think that he still has room to improve. That is not overrating.