It’s exciting to see Shyamalan on such confident footing once more, all these years later.
"Lethal Weapon 4" has all the technical skill of the first three movies in the series, but lacks the secret weapon, which was conviction. All four movies take two cop buddies and put them into spectacular and absurd action sequences, but the first three at least went through the motions of taking the plot seriously (and the first one did such a good job, it made my "best 10" list of that year). This time, we're watching an exercise.
Mel Gibson and Danny Glover star once again, as Riggs and Murtaugh, two cops who alternate between nonstop banter and dangerous action. Along the way, they've picked up a supporting cast: Leo Getz (Joe Pesci), the obnoxious but lovable accountant who joined them in the second film; Lorna Cole (Rene Russo), the Internal Affairs investigator and karate expert who came aboard in the third; Captain Travis (Steve Kahan), their long-suffering commanding officer, and, new this time, Lee Butters (Chris Rock), the cop who is secretly married to Murtaugh's pregnant daughter.
Most action movies don't stop for dialogue, but the "Lethal Weapon" pictures have always had a soft spot for human comedy, and there's a lot of repartee in this movie, some of it funny, as when Murtaugh and Riggs debate whether to take another deadly chance or not. There's a scene where they all wind up inhaling laughing gas in a dentist's office, and it works, too, but other dialogue scenes are just mechanical exercises: characters talking as if oblivious to danger.
The series' other trademark is its spectacular special effects and stunt sequences. There's a brilliant freeway chase that involves a mobile home and a long sheet of plastic that drags Gibson behind it down the highway. Also one of those obligatory self-contained opening sequences (man in armor sprays city with flame-thrower and automatic rifle fire, and is distracted by Murtaugh in underwear while Riggs shoots his fuel tank and he jets into a gad truck, etc). And a climax in one of those factory spaces that seems to manufacture mostly water and steam.