5-Note Superstar

I don't get it - why is Taylor Swift so popular?  Skinny, white girl with a 5-note range?  Her voice is average and thin when she ventures above her comfort zone, no dance moves, and simple, forgettable songwriting.  I'm sure she's a nice girl, but a musical superstar? 

I listened to her sing an unremarkable song on Ellen today and I really don't get it.  She's selling zillions of records, performing everywhere and winning awards - what am I missing?