I got my first listen to D-12s track Biggest G (hat tip to commenter D-12Lover on The Eminem Blog):
D-12
-The Biggest G

I'm not feeling anything about it, except the (sorta) chopped "I'm the Biggest G..." part in the hook. They'll get the benefit of doubt from me though, since it sounds like the ole for-radio-first-track-release routine.

I really don't care enough to look into it further, but, commenters on Hip HopDX somewhat agree with me, though in more harsh tones.