As someone who despised pop culture (and still do except Katy) until about 5-6 months ago, I understand where some of the Beatles fans are coming from. I strongly disliked any performances current artists did of Led Zeppelin songs, although I appreciated the effort to cover it. Now on the other end of the spectrum, I see both sides. I think Katy's voice was beautiful, and she did a great rendition of the song. But if I was not a fan of Katy and was a huge Beatles-nut, I would probably think it sucked simply because it was a current artist who is generally viewed as just another popstar.