Rambo: First Blood is one of the original blockbuster action movies, totally macho and totally cool. The 4th installment of this movie is John Rambo taking on bad people made of plasticine who when shot either explode into bits or are cut in half.
A badly written, badly shot and badly choreographed movie, the level of violence and gore is astounding. To reinforce that these bad people are bad, there are multiples scenes of them decapitating people, hanging children, shooting and burning babies and more. In fact maybe a little too much time is spent on the sadism of these abd people.
There is also an underlying theme that the only way to solve a situation is with violence. Again and again it shoves the fact that non-violence is a waste of time right down your throat and that Christian missionaries are fools and in the end they too will come round to the use of violence.
A total waste of money to see this in the cinema. Rent this on DVD, along with some early Peter Jackson movies and drink a lot of alcohol. This is the original movie with every single good thing about it removed and replaced with third rate production.
Update: This chart says it all.