While I hold Opeth in high respect, my opinion comes not from Homerism.
Opeth's - Damnation was my favorite album of theirs, so this album will very well appeal to me.
As a singer myself, I am attracted to a beautiful, crisp, and clear voice coming from the mic... and with death metal growls, I cannot acheive this sense. They do not take much skill, they do not take a lot of melody to use, and you can barely understand the lyrics... which is another issue I am critical of.
Music is all just subjective to the listener, and for one I am glad a greatly talented band such as Opeth are going to put out something that caters to someone with a more experienced ear for clean vocals. Which is something the metal genre's need more of imo.