And now we have gotten to the root of the problem with blanket commentary like "Rap sucks." Rap is a very diverse field of music, and only an ignoramus could write it all off as one package.
What blanket commentary? Who are you quoting? I'm thoroughly bemused by your response. I was looking for something definitive for the genre. I could be wrong, but what you put forward seemed slightly outside of the genre, or at least not representative. I was looking for the rap equivalent of Sgt. Pepper or the Dark Side of the Moon, if such a thing exists.
Sgt Pepper would be "It Takes A Nation Of Millions To Hold Us Back" by Public Enemy, and Dark Side of The Moon would either be "Enter The Wu-Tang (36 Chambers)" by the Wu-Tang Clan or "Bizarre Ride II the Pharcyde" by Pharcyde.