Nice review by Tom Barrister. Just finished reading Little Girl Blue, very interesting biography. This movie leaves out a lot of details, and glosses over a few major moments in Karen's life. Specifically, the extent to which she went to hide her anorexia (as someone said she was the most honest person except she would lie like a trooper about her anorexia), her solo album which was criticized by Richard among others and scrapped, and finally her disastrous marriage to a gold digging liar. As for lots being filmed then scrapped because of the family, Richard was an executive producer and guess he was trying to protect the family, especially his mother. I read somewhere the family was sorry they helped make the movie because they think it wasn't fair in parts. IMHO the movie does a good job overall portraying the success, talent (that voice!) and tragedy of KC. Like Tom Barrister said in his review, a voice like that comes along every few decades.
ps my favorite song is Superstar. THAT VOICE!