Nas albums:
Illmatic: 5/5 (!!) (really, this is one of the best hiphop-albums ever recorded)
It Was Written: 4.5/5
I Am: 3.75/5
Nastradamus: 3.25/5
Stillmatic: 4.25/5
God's Son: 4/5
Street's Disciple: 3/5
Dangerdoom is indeed a collabo between MF Doom and Danger Mouse. It has already leaked on the net, shouldn't be to hard to find.