"Poll question: Which MC is the best featured guest?"
I was listening to Inspectah Deck on Cold World and thinking that he has one of the best track records guesting on other musician's tracks.
Mos Def is another along with Method Man. Dre 3K is a bit of a stretch because he hasn't done alot of features, but he's dope when he does appear on another MC's song.
Kendrick is good too, but I could only list 6 here.