I love this movie.
A lot of this is down to Geena Davis' winning performance as the amnesiac suburban mom who discovers she's really a lethal weapon. Davis has done a lot of work behind the scenes since then with the Geena Davis Institute on Gender in Media and while promoting the film she spoke about how her then-husband Harlin would balance the punishment she took on screen with therapeutic massage at night. She takes a beating in this film, but she's also warm and funny as well.
Samuel L. Jackson is great fun of course: Shane Black's script (written before repeating Lethal Weapon films sucked a lot of life out of him) sets him up as fairly hapless and yet always hopeful, though he can't get song lyrics right (heh!). Brian Cox is terrific (of course) in a small role and utters one of the funniest lines in the film (although the humour is due as much to his dry delivery as to the line). Craig Bierko makes for a fetching psychopath. David Morse and Patrick Malahide offer terrific performances as well in supporting roles. But this is Davis' star turn and she makes the most of it.
Chefs do that.
See the round-up of overlooked films, television and other audio-visuals over at Todd's blog. And if you haven't seen this film? Do. Look, it's really cheap. And it totally kicks ass.