I have heard much worse, like when I try to replicate Demon Of The Fall.
I need to learn how to scream. I have a fairly deep voice, but when I'm playing guitar I find it really hard to get the death metal growl out of me.
That being said Johan Hegg is the best (IMO) death screamer in the world today. I think Mike beats him in my books because Mike is an absolutely brilliant guitar player and also sings paralysingly clearly when he does.
KFK