This movie is in many ways pretty formulaic and cliched, there's crooked cops who want to bush whack a witness and believe that trusting him to the care of an alcoholic burn out approaching retirement is precisely how to do it. However, they didnt count on said cop's righteous indignation at the whole affair rather than complicity in it.
There are some other cliched themes too, about whether people are capable of change, once a crook always a crook and whether people can surprise you and if that is enough to bring about a change of heart from cynicism to optimism. This kind of drama has been done before, most notable examples could be films such as The Gauntlet  [DVD
] but I dont think the "one good man" idea can be played out entirely and there probably is, realistically, no other break on corruption, at least in the movies.
The film is paced fine and doesnt lose momentum throughout, although it can seem a little clunky with changes in the role Willis' character plays, from protecting the witness, to offering to be the witness himself but it makes sense and is consistent with the plot progression.
There are a couple of lines and scenes which I really liked, including Willis' character's complete cynicism/depression being portrayed in a line that "life is too long" and another scene in which a character who rabbles does so to fool an adversary who is closing in on him. This is move away from the sorts of action hero cop movies like Die Hard: Legacy Collection (Films 1-5) [Blu-ray] [1988
] which Willis is known for towards something more drama driven. Striking Distance [DVD] [1994
] I thought was better in this respect but still more of an action flick than this movie.