Truffault wanted to make a reverse image of 'Jules & Jim' with one man involved with two women. He managed that but the characters are false, pretentious, cardboard cut-outs reciting speeches not real people, rather as Rohmer does frequently. The whole piece has no reality, nothing is believable. The acting is mannered and theatrical. Leaud is not good, he never is except in '400 Blows'.
I agree with the previous reviewer; this film is false, however, it makes sense, it is a reasonably common situation, a young men being in love with two sisters and unable to choose. The English characters were somewhat wooden, but the locations are gorgeous and, for me a bonus, the French clear and easily understood. Not a great film, but much better than watching tv!