Pretty much a rehash of 'Rambo 3'
I personally found this movie to be the weakest in the series. Sure "Rambo 3" (which is often the most criticized) had a fair amount of cheesiness to it, but I still find it a lot more entertaining than the fourth installment.
I'm not saying that Rambo 4 is bad, it's just that I found it to be nothing more than a rehash of the previous movies, mostly Rambo 3.
I find it rather amusing that people call Rambo 4 the "best" and Rambo 3 the "worst" AND YET, almost 90% of Rambo 4's basic plot is just the same as Rambo 3:
Rambo is living as a commoner in exile
People come to ask Rambo for help
Rambo warns them against going into the warzone
The people get caught
Someone comes and informs Rambo about their capture
Rambo goes into the warzone to rescue them
The military leader in the warzone is exceptionally brutal
He is committing genocide
Even the scene where Rambo starts shooting the jeep-mounted machine gun is almost identical to a similar scene from Rambo 3.
The final rescue of the hostages from the POW camp in the rainy night was also pretty similar to the scene in the POW camp in "Rambo 2", complete with prostitutes and pigs.
The end where Rambo is walking wearing his green jacket is the same as that from the beginning of Rambo 1, although I am guessing that this was more of a homage.
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Maybe, just once, someone will call me 'Sir' without adding, 'You're making a scene.'