I liked the first act, but after that the movie is very low on the fun. Everybody phoned it in.
This wasn't the movie MIB needed to continue on past the original 3.
A capable cast letdown by the script and story. Movie needed a big bad because everyone else was dry.
At least they kept the budget modest.
Had to turn it off not even 20 minutes into the movie. Terrible dialogue and writing. Lacked maturity.
I could see from the start it was suffering from the trappings of trying to be a modern romantic comedy and not just tell a good story.