Controversial opinion - I have almost totally rebelled against Cookie Monster vocals in Metal. If a band is going to use them, there had better be a reason of sorts, and they should impress just as much as any other instrument. I think Metal has forgotten just how important the singer (note here singer, not vocalist) of the band is. Yes, yes, blistering guitars still reign supreme, but few things in Metal can ruin a good sound like an awful frontman. I am not sure Metal can even advance as an art form until it moves past its current reliance on growls, squeals, and other fucking animal noises being passed off as something worth listening to, and into something that can be considered by the layman as talented pipes.
The lead singer of a worthwhile Metal band should be able to go up on that stupid fucking Americas Got Talent shitshow and blow the rest of the contestants out of the water.