So I don't get it...

So really, what's the deal with Megan on American Idol? Like, I thought this was a singing competition. I don't understand why she's on there. I tried cleaning out my ears in the case that maybe I'm not hearing something right. She awful!! Why is she still on the show? How'd she even GET on the show?? I'm really confused. I could understand if she had some kind of challenge like the blind dude where everyone feels sorry for you so they continue to vote for you. But I mean, COME ON!! What's the deal?? Does anyone have any kind of explanation? Can anyone help me out here?