If you go into this movie as a fan of Katy Perry, you'll love it. If you don't like her at all, you won't like the movie. Plain and simple.
As a fan of Katy Perry, I juggled with the idea of actually paying money to see this in the theater because I wouldn't say I'm a hardcore fan. But I decided I would go to experience the 3D effects. The 3D did not disappoint. It added a dimension to some of the concert scenes making the atmosphere fun and bubbly. The concert scenes were mixed in with behind the scenes looks at what goes into being Katy Perry.
Now if you are not a huge fan of her, you probably won't want to see the movie. It does give a really personal and at times, tragic, look into super stardom. And at the end of the movie you might find yourself liking Katy more.
Overall, it really is a film for fans. Nothing more, nothing less.