I agree some go overboard against Semi, but I think lots of people do the same in his favor. He's a good defender, and he can play a role off the bench as a defensive sub. Unless his offense gets a lot better, he won't be more than that. If this team were at full strength, he wouldn't play very much, if at all.
Next year, if Brown, Tatum, Hayward, and Morris are all still on the team and healthy, he won't play very much. That's not a knock on him, I just think he's nothing more than a defensive role player right now. It's not just his shooting that's a problem on offense, he doesn't handle the ball well, he doesn't finish well at the rim, he doesn't get to the free throw line, he doesn't pass well. He adds almost nothing on offense. He's done well with his defensive assignments, but that doesn't mean he's a future star.
Looking at next year's potential roster, subject to change of course, they will have - Kyrie, Brown, Tatum, Hayward, Horford, Rozier, Morris, Theis, maybe Smart and Baynes. That's possibly 10 that would be better than Semi. Now some of those guys might not be around, but I think that Danny would look to add players if they lose anyone. Unless there are injuries I expect Semi to be the 11th or 12th man on the roster at best. That's good for a second round pick, but let's not anoint him as the next big thing just yet.