"Wrecking Ball"'s instrumental is essentially "Wide Awake" with a beat in the chorus (those fluttering synths in the verses are a particularly shameless rehash), Katy has clearly replaced Ke$ha and Britney as Dr. Luke's top priority and is the new ground zero for his evolution in sound (the same way "TiK ToK" and "Hold It Against Me" were the blueprint for his productions for a couple of years). Look out for Dark Horse 2.0 next year as Selena Gomez's or a similar B-list starlet's lead single.
Wrecking Ball ***** left right and center all over Wide Awake's sad corpse though.
I didn't think it was that bad. I mean, the crowd's energy was just morbid - they were NOT having it - and her outfit was ugly but that's it. She's done WAY worse live vocals.