TCM has an article, as does The Oscar Site. The New York Times has a review which says,
here, at least, is good entertainment by any standards, including the artistic, and convincing proof that Hollywood need not travel to Ruritania for its plots; there is drama aplenty in its own backyard.
I've seen the 1976 Barbra Streisand/Kris Kristofferson remake of this film but not the 1954 Judy Garland movie.
I'm keeping a list of other movies about movies I've watched here.