The Sherman brothers (look them up) wrote some classic tunes, most of which were for Disney. The songs all sound the same, and although in small doses, that's fine, and even often joyous, in a musical, it's just repetitive.
Also, this show makes no sense. The car is alive? It's a miracle? What is it??
When I was a child I used to have a reoccurring nightmare that I was in a car alone and it would drive off by itself. I think this is a COMMON childhood nightmare. I just can't see ever wanting to see a show where my nightmare essentially came true.
Trivia: the Chitty Chitty Bang Bang car is the most expensive prop ever created for the stage!
Chris, who did grow up with the movie, told me this scene with the wonderful Dick Van Dyke, was worth watching, and I agree, so here's a video.
Music and Lyrics by Richard M. Sherman and Robert B. Sherman
Book by Jerry Sams