I take it you disagree.
That's 'm'kay' with me. But here are the problems, at least as I see it (and I can't help but watch the thing as a guitarist, sue me.)
Let us count the ways ...
The Telecaster sounds *exactly* the same as the pointy-headstock thingy the devil's minion is playing. I know Vai played both "solos," but c'mon: Couldn't a studio flunky have put a Tele and a slide in Vai's hands during the recording of Ralphy's parts? Just for the sake of, ya know, verisimilitude or something?
Vai's fingers do not cramp up. The fingers of Satan's guitar players do not cramp up. Four of five theologians agree on this point. Verisimilitude again. Or something.
Finally -- and this is the worst part, since we're busy extolling the blues and all that jazz in this here thread -- the entire film spends itself out playing up the purity of the blues as a path to -- I dunno, redemption, musical nirvana, whatever. Then Ralphy (or Vai) saves the day with some fancy-schmancy classical arpeggios.
As Eric Clapton noted in an interview on his reaction to the movie (and I quote), "That **** had absolutely nothing to do with anything." Indeed.
I know it's just a movie and not a Guitar Player magazine documentary, but with Arlen Roth and Steve Vai involved in the project, I have to think the director was ignoring some pretty good advice.