The film - the pilot for the second season of the popular TV Show - is fair-at-best because of its convoluted plot and sometimes-annoying cast, led by the two "hip" heroes: Don Johnson and Philip Michael Thomas.
What I really liked was the soundtrack, one of the best I've ever heard. Jan Hammer's unique sound is fascinating, plus there are several good vocals. There are also several good action scenes except they tend to have the Rambo mentality meaning the good guys never get hit despite a ton of bullets fired at them.
In summary: a routine Miami Vice show elevated by a super soundtrack.