Recent commentary lends itself to more positive reviews than you gave, just FWIW. As of June 3rd, he's listed at 360 at the Sound Mind Sound Body camp event up in Detroit and was noted as being the second best defensive player there (any position) by the 247 Football Scouting Director Steve Wiltfong.
Here's some tweets from Wiltfong about Juan Harris (the first with a quick vine) from the last two weeks. He seems to be pretty highly viewed by national talent evaluators.
https://twitter.com/SWiltfong247/status/741345100685561856
https://twitter.com/SWiltfong247/status/738748614722224128
Maybe the combination of these reviews would lend us to an assessment that he is a decent floor, good upside project guy?
He has a lot of upside, but there a lot of questions out there that debate on whether or not he can reach it. If you watched an entire game of his, he never really stands out.