Broken down, washed up alcoholic police detective Jack Mosley is given the mundane task of escorting a witness 16 blocks from the precinct to the courthouse, and is given about 118 minutes to complete the job. Things don't go as planned, and prove far from easy however, as a legion of crooked cops want the witness dead, and will not stop until that happens.
Essentially this is just a contemporary update of the Eastwood film The Gauntlet, and, despite it being rather generic, formulaic, and predictable, I still enjoyed it, had a good time, and found enough stuff to like to give it a recommendation. I'm giving it an extra half star (basically a barely made it B-) because I dug the character interactions, and appreciated that this wasn't entirely an over-the-top action fest.
Willis is pretty decent as basically an older, more human, more vulnerable, less wisecrackin' John McClane and he conveys the feelings of regret, depression, and being burnt out very well. As the witness Eddie Bunker (named after real life criminal turned actor Edward Bunker) Mos Def is a mumbling motormouth, and he seriously spends almost all of his screentime talking nonstop, and, despite being rather annoying, he didn't come off as grating like the types of characters Chris Tucker plays, and he is also somewhat likeable. David Morse is less developed and fleshed out in his role as Mosley's former partner/the chief antagonist, but he does okay.
The movie is lacking a super strong plot (as far as the specifics and motivations go), but the performances and character interactions are good, the action is fine, and it's never boring. Give it a watch, like as a rainy day boredom sort of thing.