Roar is doing extremely well, but I still can't help but feel disappointed. They could have gone with just about any song and it would've been a hit, so I feel like they should have went with one that could potentially be regarded as iconic years down the line. Roar isn't it, it's just typical Dr. Luke candy.
I hope she crafts some experimental sounds, I'm listening to Foxes (from Clarity), and I feel like Katy could really shine on some of those tracks.