Meh. Each sequel was lesser in quality than the previous film, and I didn't like 4. Not sure where Shane Black can go with it considering he hates what they did to Riggs, going all the way back to the first movie.
I just told a friend yesterday that they would make a 5th because Mel Gibson is a racist pig and he needs to clean up his image.
If Mel became the president of Iran, he could wish Israel be nuked off the face of the earth and say the Holocaust never happened and no one would dare call him racist or evil.