Too many to name, though let's try.
I cringe looking back on the 2001 NBA Draft, thought Eddy Curry was going to be the next Shaq, thought DeSagana Diop was going to be a better version of Mutombo, thought Kedrick Brown was going to be what Jaylen Brown is now and projects to be.
Thought Danny Fortson would be the next Barkley (even before he was on the C's).
Thought Ron Mercer would be a perennial 20+ppg performer (before he was on the C's) and thought for sure have his number hanging in the rafters.
Thought Lamar Odom would be a better version of a prime Grant Hill.
Thought Steve Francis would have a long stretch where he'd play like present day James Harden.
Liked a lot of PGs. Liked Speedy Claxton, Marcus Banks. Bought into the NYC PG hype for guys like Omar Cook, Erick Barkley, God Shammgod, Sebastian Telfair. Thought Marcus Williams would have a Rondo-like career. Kenny Brunner (Bad Santa on the And1 tour) played a year at Georgetown where he was leading the Big East in apg then abruptly left school to transfer to Fresno State where he was then kicked off the team for using a samurai sword to rob a man, thought he'd have a Terrell Brandon-like career. Jamaal Tinsley was probably the only guy I liked who actually had a decent NBA career. Thought Mustafa Shakur looked like an All-Star caliber PG (before college).
Thought Mike Sweetney would have a Zach Randolph-like career.
Thought Jay Williams would have Chris Paul level of success (don't be fooled, it wasn't the motorcycle injury that did him in, he was terrible in the NBA before that).
Thought Dajuan Wagner would be like a prime Gilbert Arenas.
Thought Shawn Respert would be a shorter Ray Allen (turns out he was battling stomach cancer throughout his career though, so I'll give myself a pass here).
Thought Ronnie Brewer would break out like Gerald Wallace did.
Thought Courtney Lee would turn into a fringe All-Star, a lesser version of Jimmy Butler, a better version of Avery Bradley. Thought Bill Walker could actually be like Jimmy Butler or Ron Artest. (This was before both were Celtics).
Thought Fab Melo could be the next Rudy Gobert (this was before he was a Celtic).
Various players I liked that barely sniffed the NBA or never even made it, that I thought would have long NBA careers as role players: Ed Cota, Julius Hodge, Laron Profit, Alvin Jones, Lavor Postell, Danya Abrams, Dion Glover, Patrick Ewing, Jr.