The crime/investigation aspects of the film are what draw you in for the most part, where Chase plays an investigative reporter on the trail of a hot story involving police corruption and drugs. I was genuinely surprised that the film succeeded more in this area than in the comedy, but I think that just goes to show you that Fletch, for all of it's issues, does surprise you. Whether it's a good surprise is up to your mood or taste. As it stands, Fletch was only marginally funny, and the film as a whole only works because of Chevy Chase.
I hear a reboot is in the works with Jon Hamm? While that idea is interesting, they really need to figure out what genre they're attempting first, because this version certainly wasn't a comedy, even though it's marketed as one. Don't get me wrong. I enjoyed it. It was just a different type of film than I was expecting. Killer theme song by the great Harold Faltermeyer by the way. I mean, it's really great and probably one of the most memorable things about the film.