https://screenrant.com/mash-every-season-ranked/

MASH is one of the most groundbreaking shows ever. While it maintained its quality throughout its run, some of its seasons were better than others.

This is a very interesting topic. My personal rankings of the season are (from best to worst):

Season 3
Season 4
Season 5
Season 7
Season 2
Season 6
Season 1
Season 9
Season 11
Season 8
Season 10

It just got to "preachy" and dramatic at the end for my tastes. I enjoy the earlier seasons a lot more.