It's not really a matter of film, IMO. Yes you can pick out issues on film whether it be choppy lower body mechanics or a tendency to take risks that would have burned him at the Power 5 level, some times he looked as if he wasn't really seeing the defense, etc. But that's not really it.
I think it's a dismissal of risks. This is a prospect with 600 pass attempts at the college level. He switched to QB halfway through high school too, so it's not as if he's been eating and breathing quarterbacking theory since he was a littl'n like Jameis Winston.
Normally a guy with 600 college attempts, especially since the tape is by no means perfect, would get skewered to some degree. Guys like Ryan Tannehill and Mark Sanchez took their lumps because of it, and the lack of experience constituted major arguments against them that they needed to overcome one way or another. With Wentz it seems as if he's completely skated through that question. I don't even see it raised. Yet this guy had 600 snaps at the FCS level, those other guys had low experience at the major Power 5 level of FBS football.
Then he gets compared to Flacco. Well first off he doesn't have Flacco's freakshow arm. Good arm for sure, but he's not a freakshow. Second Flacco had 50% more college tape than Wentz did. Third Flacco did actually face some FBS competition and acquitted himself well. When Wentz went against the FBS, if I remember right it was Iowa State's porous defense and Wentz had, let's face it, kind of a "meh" day against them.
I think in this draft the evaluaters really just want an elite QB prospect to reveal himself, and so they're making it happen.
The way I see it Wentz isn't even necessarily up with Goff, Cook and Lynch. There are things to like about all four players. But there are things to dislike a lot, to where I don't think I can make any of them my first pick in the draft. I'd just hold tight and then pick up the one that seems to fit my system and style of coaching best.
Connor Cook goes a little under-appreciated. The way he sets up his throws with his feet is really impressive, quick delivery, pro style decision making. Wouldn't be shocked if he's the guy that finds his way to immediate success. His maturity problems are probably just a function of age. There are QBs in the Hall of Fame that were complete a-holes when they played.