Relapse, Refill, and Recovery were all very low on features. He could have had any rapper in the world feature on him, and the ONLY non-Aftermath rapper he picked was Weezy.

Encore and Eminem Show had some, but MMLP had the best diversity of features.
Eminem has so many possible opportunities for good features now.
- Yelawolf
- Dre
- 50 Cent, G-Unit
- D12
- Royce (BME)
- Slaughterhouse
I'd like to see them all on his next album.