Other than significant event creation I can't really trust any college player being labeled as 'good' or 'great'. Way too many guys were really good college defenders who didn't rise above average in the NBA, and some well below.
College game is just too divorced from the NBA combined with talent flux within all of D-1 and systems to believe in. I only trust do ented events creation like steals, blocks, and deflections and even those have to be taken with a grain of salt. The advance stats aren't entirely trustworthy.
Vassell had the defensive numbers of a great great great defender but has disappointed compared to his college game when he had gaudy advanced stats that impressed the out of me like a ridiculous amount of pick and rolls guarded ending in turnovers. Sometimes it's all system based, Florida State just made Vassell, Barnes, and Patrick Williams look better than they were.
Culver was supposed to be a good defender at minimum. Davion Mitc drafted into the lottery on his defense alone, he probably wouldn't make any all defense teams even going 7 or 8 deep, while Caruso was another bench guard would. And on and on and on .... So when I see things like "Stephon Castle is a great defender" , can that be trusted enough to forecast to the NBA? Because Vassell was supposed to be great, and the best in his class ... And I don't watch enough college to have an informed enough understanding of the UConn system vs other teams systems to have confidence.
I have a little more faith in pro leagues where at least everyone was good enough to get paid and was working towards getting paid in the future, whereas college doesn't have that across the board.