Personally, I believe this to be one of the most intelligent comedies ever made. It might not appear that way at first because the film does have its share of simple slapstick and "naughty" moments, but generally, the topics the Pythons tackle here are very serious - albeit dealt with in a way that makes this a true contender for the funniest film of all time.
A firework of hilarious sketches, timeless quotes and clever comments on the human condition, this film was deemed too dangerous for the masses and therefore, until recently, banned in several countries (normally, this only used to happen to the so called "Video Nasties").
This film never once makes fun of Jesus (Christ) - but it DOES take the mickey out of blind, fanatic followers of any political movement or religion.
An outstanding achievement and endlessly re-watchable.
My vote: 10 out of 10
Favorite films: http://www.IMDb.com/list/mkjOKvqlSBs/
Lesser-known Masterpieces: http://www.imdb.com/list/ls070242495/
Favorite Low-Budget and B-Movies: http://www.imdb.com/list/ls054808375/
Favorite TV-Shows reviewed: http://www.imdb.com/list/ls075552387/