Dr. Luke has had so many flops over the past few years....You Da One, Oath, Give It 2 U, C'Mon, Crazy Kids, Walks Like Rihanna, Ooh La La, Both of Us, Better Than I Know Myself, Never Close Our Eyes, Va Va Voom
In fact since 2012 started most of his singles have flopped. People rip on Katy all the time for relying on him and only putting out "easy hits" but in fact putting out a hit is nowhere near as easy as it seems, even if you're using Dr. Luke.