She's certainly not the best, but I love Sara Bareilles's writing, and she actually writes most of her stuff on her own, unlike these co-writers you have listed here.
OH and if we are going to do the country girls way, then Miranda Lambert can write circles around Taylor Swift.
You do know Miranda didn't write THTBM right? I'd say they are about even Miranda is an amazing writer but most people I see who say she is a better writer say it is because of that song
