The movie itself was not awful but it seemed to gloss over absolutely everything. The backdrop of the movie is Perry's California Dreams Tour, which began on February 20, 2011 and ended on January 22, 2012. Despite the fact that this gives the documentarians almost an entire year worth of material to use, the film itself runs only 97 minutes. As a result, you only get blips and soundbites about her life. I would have loved to have an extra hour of footage to see more about the girl behind the Katy Perry persona.
If they didn't want to talk about her personal life (poor Russell Brand is shown giving a few kisses then it's nothing but text messages...I'm sure there was more to their relationship), they should have gone the Hannah Montana/Miley Cyrus route and just filmed the concert with a few background rehearsal snippets. It would have been infinitely more interesting since her concert looks like it was a ball of fun.
Sadly, I can't recommend this movie to anyone. I think even die hard Perry fans would be disappointed. Wait for the Blu Ray. From what I hear, there will be additional footage in the extras. Maybe there will be something good in there.