Her music is genuinely better than most of those.But I'm surprised that even Born This Way got a good score.Many parts of it felt massively underwhelming at first listen,but it grew like anything later.
She has the better music and everyone knows it. Let's not forget that out of all those pop girls you mentioned, Beyoncé and her are the only one with Grammy award winning ALBUMS. The only girls only stand out with their quick singles.
Because she doesn't do conventional pop music
She's a little dark and uses different genres in a weird way
Which is partly why I can't get into her, the other reasons being she's pretentious and annoying