We know nothing of the past of the character Sly plays, and that doesn't make him interesting but rather boring. That's most of the story doesn't have, to me, a much deeper impact.
Still, Donald Sutherland in his over-the-top performance is very much welcome in spite of his limited screen time.
Classic prison movie with Sly on fine form. What the movie lacks in realism and subtlety it makes up in with swift storytelling and fine casting. The performances are pretty good although the actors deal with shallow stereotypes. The score is also pretty good. A good watch if expectations are adjusted.