Umm, by what standard? That they are incredibly gifted musicians? That the vocals are killer? That their live show blows most other shows out of the water? Not sure where you're getting this overrated thing from.
They look like a bunch of douchbags on stage. Yeah obviously they can sing and play well, but their style is meh IMO. Vocal ability is there, but its SUPER annoying to listen to the dude sing.