What I think she’s saying now is that most of the other pop songs suck, ’cause they aren’t expressing anything. I’ll have to admit, her songs does have a certain meaning, and she said Party in the U.S. wasn’t going to be popular in her mind, which meant that the song that had the least meaning, she disliked.
However, her lyrics are godawful in that can’t be tamed song, seriously, no.
First of all, I think limiting music’s worth to how “meaningful the lyrics are” is stupid. There’s much more to music than profound lyrics, and I can assure you that none of Miley’s lyrics are profound. Sure, they have meaning, but it’s the same way a generic summer blockbuster’s plot has meaning. Yeah, it’s there, but it’s not very good.
Pop music IS about having fun, keeping things fresh and exciting. It really is about having a good time, so if you don’t like that concept, don’t bother with it.