What are regarded as some of the best hip-hop albums of all time?
Some hip hop albums that are widely regarded as some of the best of all time are: 

Illmatic - Nas
My Beautiful Dark Twisted Fantasy - Kanye West
Aquemini - Outkast
The Blueprint - Jay-Z
ATLiens - Outkast
To Pimp a Butterfly - Kendrick Lamar
The Chronic - Dr. Dre
Graduation - Kanye West
good kid, m.A.A.d city - Kendrick Lamar