Just got back from Rio. Great movie. My mom and my brothers were at the front row, I started at the front but it was hurting my eyes so I went searching for a better seat and eventually found one, so I sat on my own at the back, my mom and brothers ended up leaving and getting a refund because it was hurting there eyes being so close to the front.
I don't think any negative number would sufficiently express your dislike for the movie.
I appreciate Justin Bieber for his talents, but I find that creating a film that introduces his life is merely a commercial act - to get fans "closer" to him and hopefully to get more fans after you've showed his apparently "kind and friendly" side other than on stage.
That last movie that I watched was Pirates of the Caribbean On Stranger Tides. It was good, but not as good as the previous ones. As long as they keep Johnny Depp in it, they can keep making more.