Seriously, listen to some albums from the 90's and 2000's and search around on the internet and I guarantee you will at least find something you like. I don't know how anyone can say an entire genre of music sucks because that is such a broad statement. There are THOUSANDS of rap songs that are NOT on the radio that are great. .
Even today there are many good rap albums coming out. Last year Kendrick Lamar's GOOD Kidd M.A.A.D. City came out, which was one of the best albums I've ever listened to. Off the top of my head
-Killer Mike - R.A.P. Music
-Kanye - MBDTF
-Pusha T - Wrath of Caine (except for the song with the French Montana hook. No. Just No.)
-Big Boi - Vicious Lies and Dangerous Rumors
-A$AP Rocky - Live.Love.A$AP/Long.Live.A$AP
-Chance The Rapper - Acid Rap (Came out yesterday, get it off of chanceraps.com)/10 Day
-Apollo Brown and OC - Trophies
-Evidence - Cats and Dogs
-Big K.R.I.T. - King Remembered In Time, Return of 4eva, KRIT wuz here
-Freddie Gibbs - Cold Day In Hell/BFK
-Macklemore and Ryan Lewis - The Heist
-SchoolBoy Q -Habits and Contradictions
-Nas - Life is Good
-Captain Murphy (Flying Lotus) - Duality
-El-P - Cancer4Cure