f**k what you heard...this "accent" or whatever you guys labeled it as opens up a whole variety of wordplay and metaphors. It goes very well with the whole Relapse concept and it seems like he is literally bout to have one. The worst possible thing Eminem coulda did was to be repetitive, using the same voice and flow he did years ago. People would get sick of that s**t and complain about that.
What the f**k is you talkin about? What the accent gotta do with metaphors?
The accent aint that big of a deal but I prefer just Em goin in.