I never really got the hate for Roar. I love it.

I was so in love with it when it came out, it was my favourite song. I don't like it that much now, but still love it.
I genuinely think it's because of the music video. It'a a great music video, Katy looks her hottest in it but I think it does the song no justice. I personally expected something different. And it was honestly a downgrade, I mean, all the music videos from Teenage Dream ( minus POM probably ) were slightly better.