What's wrong is the approach: virtuosity seems almost to have become an end in itself, and, as the film charts the experiences of Sam 'Ace' Rothstein (De Niro), a gambler the Mob places in charge of the Tangiers casino, Scorsese's dazzling, kinetic technique calls attention to itself so persistently that story and characters retreat into the background. There's even something inherently fascinating about the subject - the way Las Vegas, and the organised criminals who run it, have changed over the last couple of decades. Scorsese's movie is technically impressive.