Stokes could be one of the most under rated and best values of the draft.
I love Jarnell, and think he was the best player in the SEC this year, hands down. But I don't see him lasting long in the NBA. At 6'8" he'll need to develop some ball handling skills and/or a midrange game. That baby hook that he relied on in college isn't going to cut it at that level.
OTOH, I think J-Mac has the skills to succeed, especially since he was traded to Philly. Their roster is pretty wide open (read: "bad"), and he's going to get an opportunity to play a lot of minutes there.