The drugs ruined him a little but he's still got it.
His motor skills seem to be intact which shows that though he was abusing drugs that he had it somewaht under controll to not entirely ruin his body.
I think his biggest problem is that being the biggest act on Universal comes with too many yes men. How can he collectively make anything good if the people around him are scared of being fired if he doesn't like what they do.
Would you tell Eminem his flows fell off if he gave you a chance to sign to Shady Records and give you the biggest push of your life -- I think not.
Imagine a world where 50 Cent is the most outspoken emcee in the history of rap speaking his mind on damn near everything but won't critique Eminem positively about his music. That's the level of shyt surrounding Eminem. his closest pardnas won't tell him what he's doing wrong and when Joe Budden calls it out he gets backlash when he was right.