1) His skin is thin. Gets offended by the slightest things and is not very professional on occasion. He could go off the boil any moment.
This has nothing to do with basketball, so I don't see how it's relevant
2) His defense is weaker. Is slower off of picks, has regressed as a man to man defender.
Our whole defense has regressed. Even AB is looking like a worse man-on-man defender this year. It's hard to really say this year whether a player's defense has actually regressed, or if the team defense is just making them look worse, but Crowder is still a very good defender, probably just outside of the top 5 at the position (which is pretty stacked, with Kawhi Leonard, Paul George, Jimmy Butler, Andre Iguadola, and Lebron James)
3) Literally can't do anything besides shoot spot up threes this year. He's basically Jason Kapono.
He's shooting 54.2% on 2 pointers this year, including a ridiculous 81% from within 3 feet. I don't know what else you expect from him
4) If he's not found open, he's essentially a black hole on offense (especially in our off the dribble, extra pass offensive philosophy)
He's averaging a career high 2.3 assists per game this year, 16th among small forwards. Considering how little he has the ball in his hands, that's actually pretty good
5) One would think that his 3pt percentage is an anomaly this season. He's said that he's not changed any mechanics or made any changes. Every time he shoots a three, his balance is different. Sometimes he sticks his leg out. Sometimes he steps both feet into it, sometimes he jumps straight up. I think hes more of a 35-37% 3pt shooter and I don't think he can maintain 42% going forward, imo. If that happens, or he regresses even more he's essentially useless. A poor man's Luc Richard Mbah a Moute.
...so one of the reasons you think he's overrated is because you think he's worse than he actually is?
I say trade him when people think his value is "high." No one knows what Hayward will do in FA. I say package him for Hayward, Jabari, etc. Hayward's game would age extremely well and his quality could be top notch even into 32-33. Jabari is so young and by the time he is 25-27 we could be real contenders.
Trading him for Hayward (who is going to be a FA this summer) would be a mistake. Don't trade good/great assets for a guy that doesn't make you a contender and that you could just sign in FA. Jabari would be an interesting option, but there's no way Milwaukee makes him available.
It seems like the problem is you underrating him, not others overrating him