Tom Cruise himself does not participate directly, this uses clips from most of his movies, essentially in chronological order, to illustrate the points being made here. It also includes many clips of Cruise in such situations as publicity appearances or behind the scenes during movie-making. Looking at the entire list of his movies since 1981, I realize I have watched almost all of them.
To me the title poses a question, not an answer, "Is Cruise the last movie star?" It is strongly suggested that he might be if you consider his career arc over 40+ years and that even in his late 50s and early 60s is still making action movies and doing his own stunts. And his blockbusters seem to be making more and more money than ever.
It touches on his involvement with Scientology, but only briefly and to point out that his avoiding discussion of it is probably better for his career.
I watched this at home, streaming on Prime. For me, a movie fan in general, I found it totally interesting and worthwhile viewing. Regardless of what one thinks of Cruise as a person, he is probably the hardest worker in the business and his movies are the better for it.