She's released a lot of top tier singles: Hot N Cold, I Kissed A Girl, Teenage Dream, Firework, E.T. It really started to fall apart later on though. Part Of Me and Wide Awake are unacceptable. I can't believe the critics sanctioned the latter as some great mature shift.
I have to say, it's a bit weird for Katheryn to try to make herself look edgier when she's using a Dr. Puke production as her lead single. But a small snippet is all that we've heard.