Before watching the movie:
A large-budget film with a star-studded cast and strict attention to period accuracy could go poorly in all sorts of ways. The actors could fight for attention to the detriment of the film, the visual appeal could be lost in gritty details or vice versa, and the effort put into the enormous practical concerns could stomp out any entertainment value of the film.
These worries are only enhanced by the subject material. I vaguely recall an adaptation of The Three Musketeers in that a young man wants to be a Musketeer, gets in a fight with some, and then they all have adventures together. Rather dull, especially if one isn’t into swashbuckling tales.
I recognize many names, but I can connect hardly any of them with anything I know. At least it’s sold as a comedy, but I don’t expect much out of a 70s film.
Usually, I avoid sequels, but this pair was intended to be a single film, so I am taking it as one.