Carsen had the toughest transition from college, as his shot wasn't automatic once the season started .I think it takes time to adjust from defence to offense and in spot minutes. That's a lot on a rookies plate.
I'm a believer. I want to make a couple of points about him:
1) His 3-pt shooting was .309, which is pretty far down there. But consider the totals: he was 21/68, which is not a whole lot of attempts. If he'd made 25 instead of 21, he would have been above league-average. Does anyone doubt that a couple of those misses, or even four of them, could easily have been makes? He's going to be very good from long range.
2) The real problem as a scorer was the drive. He just couldn't get to the rim or get an unchallenged shot in close. He's real quick with the dribble, with both hands, both directions, and has good balance to take a hit and maybe finish - but if he wants to be an NBA rotation player getting to the rim is the area he most needs to improve. And he didn't get to the line much - these two are related.
He's got a good repertoire for freeing himself up for the three - sidesteps to both sides and showed signs of a step-back, very useful at his height.
And he's got a pump fake move that gets him with one dribble into an open midrange area for an uncontested jumper; he's got enough of a stroke that that might actually be an efficient shot for him.
3) I'm bullish on his defense, too, though he got abused a lot. He's got great burst to stay in front of dribblers and good lower body strength, good intensity, gets up in his man - and I'm going to cautiously praise his anticipation, though he got beat off his mistakes way too much.
As usual people judge rookies too quickly. I say he's got NBA rotation-player upside.