The scene where the 8 year old tells him how to operate the LAW rocket launcher is a classic cinema moment.
They were trying to take the audience on a journey from "this guy is a righteous badass who has been pushed too far" to "this guy was fighting across la to murder-suicide his wife and kids, he's the bad guy" but it really didn't land. Folks remember the cool violence, not the end.
Same genre of missed satire or critique as fight club, taxi driver.