Katy Perry vs. Beach Boys vs. Michael McDonald - I Kissed a Sweet California Girl

I don't really care for Katy Perry's music, at least what I've heard thus far. I like her voice, but then it's the being-from-California-but-singing-like-you're-British-thing; I don't like it and I don't get it. (I suppose Amy Winehouse does the same thing in reverse?) I didn't get that with Green Day back in 1992 and just assumed they'd disappear from music partly due to that. Guess I was wrong then, maybe I am wrong now.