Here's mine:
1) First Blood (Rambo I)
I guess no one disagrees with this
2) Rambo: First Blood - Part 2 (Rambo II)
Though everyone agrees with FB being the best, the Rambo from this movie is what everyone thinks about when the character is mentioned
3) Rambo (Rambo IV)
I actually really, really like this movie. Didn't expect it to be this good
4) Rambo III
The decision between this and R4 came to small details here and there
5) Rambo: Last Blood (Rambo V)
Don't let the last position fool you: I think this is a great movie and a refreshing break on the whole SJW thing.