First of all, I must say that I haven't seen this last Rambo movie (Last Blood).

Secondly, I fully agree with others above, the first Rambo movie (First Blood) was the best of them all and by far!
And Rambo IV was IMO the second best of them also by far when compared to the other two Rambo movies. I really liked/enjoyed Rambo IV, I was quite surprised (positively) by this movie specially after Rambo II and III.

Third, and speaking of Rambo II and III these were UTTER CRAP! I don't have anything positive to say about Rambo II while the only positive thing about Rambo III was that it served as an inspiration for one of the funniest movies that I ever saw: Hot Shots 2