I think the big deal is that Dre is... And I can't stress this enough, he lives off of his reputation. We forget, but for a long time after The Chronic, he was already considered washed-up. The Firm had proven to be a colossal failure, he didn't want to produce whole albums for anyone else, and was drifting into R&B to not as interesting results... If it wasn't for "2001" and being tied in with the Eminem-hype machine (Because that was Iovine's brainchild, not Dre's as so often described lovingly), Dre would've been considered a Brian Wilson of rap; a man who's reach exceeded his grasp.
Since then, he's made perfectly... competent, music. Nothing too exciting, but as we all knew, Alex da Kid did "I Need A Doctor", Timbaland did "Kush", and any other new songs, is SOMEONE else. Dre is caught between trying to live up to his legacy, and then still managing to improve on the old model. It's an issue when there's so much... behind the scenes, efforts.
Take this for example, this demo? PERFECT. And then later, they gave Dre a shitty Eminem verse to replace T.I's perfectly crafted ghost-verse (which comes in after halfway through so just errr, cut that off quick.) I LOVE when rappers pretend to be Dre, btw. It's an interesting task, to pretend to be someone else who pretends to be someone..
<iframe width="480" height="360" src="
http://www.youtube.com/embed/gmDe6Cu1nJo" frameborder="0" allowfullscreen></iframe>