Good for what the purpose is.
You're certainly not tone-deaf. :P
It started out as 'Oh, I think this is a joke, because he's pretty much screaming it,' but as I listened more and more I realized that your singing skill isn't bad unless you force it (Like at 2:09) but overall you hit most notes spot-on.
I liked it, that's for sure. But keep in mind that this song would probably be much better if you stopped yelling and actually lowered the decibels a bit.