Didn't watch the whole show but saw that audition; it was indeed pretty good. I'm been burning out on it for the last couple of seasons. The last' rocker' I remember liking was that 'Laith Alseda' guy, the blues guitar shredder. I doubt I got his last name right, but he came in 'third' the season he was on. Big Jerry Garcia looking type.
I mostly favor the female vocalists. though, they're just better singers than males in general. I also think Shelton has the best ear of any of the judges, maybe Alicia Keys came close to matching him.