I liked it, but I thought he went back to Katy Perry too much.

I didn't mind that, because at least it was something I recognized, and the "I liked it" seemed to finish a sentence that some other singer started, due to the way it was pieced together. (Though that was what caused me to realize that "I Kissed a Girl" was one of the year's biggest hits. How sad for us as a nation.)
Every now and then, I think I kinda like that song "Apologize" by OneRepublic, then I realize it's just the ear candy factor of the digitized vocal, which wasn't even in the original song; it's in Timbaland's remix, so basically a bland pop/rock got popular because someone from outside the band made their song sound like fake R&B. So yeah, I have no love for the Top 40 charts this year other than "Viva la Vida".