Given the number of posts that have appeared here on "Carlito's Way," I don't think it's underrated.

My candidate for most underrated mobster/gangster flick is "Al Capone" with Rod Steiger in the title role. Many actors (including great ones like Paul Muni) have played Capone or Capone-like characters. But Steiger was the absolute best. His performance as Capone was, IMO, the finest in his long and brilliant career. The movie isn't much, but Steiger is spellbinding to watch.