The real winner of this film is the subject himself, Carrol Spinney. The film making itself is pretty straight-ahead, and the sound track is lousy (No percussion at all? Who's idea was that? This is a movie of men and muppets, for the love of puppetry give us an occasional rhythm or beat!).
That said, Carrol Spinney, the man behind the bird and the grouch, really carries the film just by being himself. Big Bird and Oscar the Grouch are iconic world-renowned characters that continue to enjoy a long legacy. And Mr. Spinney demonstrates himself to be a person full of creativity, love, joy, pain, and a genuine passion for his work and for his wife.
I would recommend this film as a solidly entertaining watch with lasting pathos. The subject is very strong and magnetic, despite the bland filmmaking and schmaltzy soundtrack.