While Rambo: Last Blood didn’t completely bomb at the box office, the Rambo sequel was comfortably the worst movie in the series. The Rambo franchise had a fascinating history that repeatedly redefined the role of its central antihero. In the modest, tonally dark original movie, Rambo: First Blood, John Rambo was a Vietnam War veteran who ended up in a bloody stand-off with a corrupt small-town sheriff's department upon his return to the US. Rambo: First Blood showed a lot of compassion toward its troubled antihero, but made it clear that Rambo was struggling to adjust to civilian life because of the atrocities he took part in while serving in the military.

https://screenrant.com/rambo-last-blood-worst-movie-ruin-franchise/