I'm buying. If you are low on this guy because of the stupid wonderlic or the fact that he tested positive for marijuana then you need to have your head examined. Dan Marino scored something like a 15 on the Wonderlic, Frank Gore something like a 6, and I'm sure a ton of other great football players fall in that range, as well.
Not to mention Calvin Johnson admitted to having smoked pot before as he was interviewing with teams before last years draft.
Harvin has speed, hands, and despite what everyone seems to think he is an exceptional route runner. His acceleration off the line of scrimmage is superb.
He's not a halfback, he will line up at the wideout spot and he will be good. Great? I don't know, but he will be good, IMO.
He does have durability issues but I think he will be fine in the pro's because he won't be carrying the ball as much as he did in college.