This is the best version of Dumas' "The Three Musketeers", not only by virtue of the cast and script -- it also, despite the heavy doses of slapstick, is the most faithful to the novel. At the time it was a daring move to have one long movie released as two. In retrospect, it was a bad idea, since the movies should be seen as a whole. Seen as two, they make up a slapstick ("The Three Musketeers") and a dark drama ("The Four Musketeers"). Seen together, the two blend well as one.
Richard Lester, who is an interesting if not always good director, does a superb job here. He handles the slapstick well, and he and the writer Geo. MacDonal Fraser (yes, the "Flashman" guy) do a great service by not only making each sword-fight scene interesting, but keeping them individual (there's a sword-fight on the ice in "The Four Musketeers" that has to be seen to be believed).
In 1989, fifteen years after these movies, the same cast, director and writer came together again for an abbreviated, single-film version of "Twenty Years After" called "Return of the Musketeers" (it's too bad Roy Kinnear and Oliver Reed are gone so they can't do "The Man in the Iron Mask"!). This film is not included, but it's a small loss. It's interesting to devotees of the original movies, but not necessary viewing for everyone.
The cast of "The Complete Musketeers" is awesome. Michael York, years before he was Basil Exposition, was a the promising young actor of the time. The three musketeers (Oliver Reed, Richard Chamberlain and Frank Finlay) are wonderful (although one may carp about Finlay's Porthos). And though it was the movie that proves she could act, Raquel Welch, the reigning sex goddess of the day, also has her more prominent assets on display in low-cut bodices. Christopher Lee, who has recently added "Star Wars","Lord of the Rings" and Mervyn Peake's "Gormenghast" to his credits, here makes a threatening Rochefort. Charlton Heston, Faye Dunaway and the rest are uniformly excellent. This is one of the best movie treats of the 1970s.