His rebounding numbers are solid for college minutes/shot clock, at least, but I can't argue with anything else you said.
Number 3: I think some of these young guys just lack a clue about their potential strengths and weaknesses. It reminds me of when Adam Morrison compared himself to Dirk Nowitzki in an interview. Sometimes I think they just talk out of their yin-yangs to get through an interview.
Just to support point number 1, I found this footage of a Hoop Summit World Team practice. Bennett appears to be number 10 in white, and that guy is completely disinterested in defense, and it leads to points for the opposition(6 or so in 3 minutes of video?). He appears to have no interest in truly closing out on shooters, and on one inbounds play doesn't even bother to get within 10 feet of his man. It's like he'd never defended a guy who could make an outside shot before....
http://www.youtube.com/watch?v=kVPiV6ZWCCQ