It's fun to use draft raters to identify high-upside sleepers, but an equally valuable use is to identify overrated, low-upside prospects. Here are some guys who've been floated as possible lottery picks that my draft rater doesn't like. It gives them a less than 10% chance of peaking as +2 impact or better players at the NBA level. Roughly speaking, that's the point at which a player's good enough to be the third guy of a "big 3."
-Tyler Herro, projected ceiling +1.5. His jumpshot is good, probably even better than my draft rater gives him credit for, but with good-not-great athleticism and ballhandling ability he may struggle to get his shot off against NBA defenses. Ended his season on a sour note, as he looked overwhelmed and faded into the background when Kentucky desperately needed him to step up and hit some big shots.
-Bruno Fernando, projected ceiling +1.5. His physical tools are enticing but he's not an outlier athlete, which makes it reasonable to doubt whether it's worth rolling the dice on the continued improvement of his skills and IQ. Not fluid and comfortable on the perimeter on either end of the court.
-Rui Hachimura, projected ceiling +1.3. His stock peaked with an upset win over Duke early in the year, but flatlined from there as he struggled with efficiency in subsequent games against major-conference foes. His weak all-around game means he'll have to be an elite scorer to be a star, and he doesn't seem quite skilled or athletic enough to pull that off.
-Nassir Little, projected ceiling +1.2. Fantastic functional athleticism at times, but middling IQ on both ends of the floor is a serious red flag. Combined with a lack of ballhandling ability this limits his offensive potential, and combined with a lack of elite size/length limits his defensive potential.
-DeAndre Hunter, projected ceiling +1.2. I think my draft rater is a little too bearish on his defense, as he was genuinely a high-impact player on that end at the college level in spite of not putting up big box score stats. There's still some truth to his low ceiling though, as he's not overwhelmingly disruptive or versatile defensively, and he doesn't have the off-the-bounce offensive creativity to suggest that he could one day take on more of a leading role.
-Keldon Johnson, projected ceiling +1.0. Like Hachimura, he'll have to be a great scorer, not merely good, to have a significantly positive overall impact. And he hasn't looked exceptional in that regard. While he's not a terrible passer or a terrible defender, he hasn't shown enough in those areas to believe that they could be cultivated into strengths at the NBA level.
-Kevin Porter Jr, projected ceiling +1.0. At his best a dynamic and athletic 3-level scorer, but not a reliable enough ballhandler and decision maker to be trusted with a leading offensive role. Similarly, inconsistent effort level and middling IQ will probably continue to keep him from fully utilizing his athletic gifts on defense.
-Sekou Doumbouya, projected ceiling +0.7. Good physical tools on paper, but in reality doesn't have the dynamic slashing/rebounding/shot blocking impact you would expect. Doesn't have the skills or IQ to really make his impact felt in any facet of the game. The youngest player in draft, but also further from being a useful NBA player than any other projected first rounder.
-Cam Reddish, projected ceiling +0.4. A year at Duke exposed his loose, sloppy handle and poor decision making with the ball. Much like Hunter, his general demeanor suggests that he's content to be a roleplayer, not driven to become a superstar. On defense he's even less versatile than Hunter, tending to shy away from contact in spite of being among the largest players on the court most of the time in college. That's a red flag that prospects rarely overcome.
-Darius Garland, projected ceiling +0.3. Take this with a grain of salt because the limited sample size, but his margin for error is small as he'll lean heavily on his 1-on-1 scoring ability to generate value. Even if he comes back from his knee injury at 100% he'll likely have a hard time defending NBA athletes at point guard, and his lack of size will make him difficult to hide.
-KZ Okpala, projected ceiling -0.8. His interesting physical tools may convince some team to roll the dice on him, but there's very little substance to his game. Doesn't have the handle, athleticism, or physicality to create efficient offense against good defenders, and seriously underwhelming defensively due to a lack of functional athleticism and IQ. The odds are strongly against him being a rotation player, let alone a star.