Ha this looks tech.
TBH I think you can judge a rapper on SO many different things, e.g I respect any rapper who can make it big without shitting on some other nigga in his rhyme, without boasting about getting big or rapping about something about 'Bitches and hoes in different area codes'
So:
Best rappers for their rhymes:
1. Notorious B.I.G (Juicy, these lyrics are crazy!)
2. Kanye West (Hate or love it, this kid has style and is smooth is hell)
3. Jay-Z ( Tightely contended with the likes of Talib Kweli, Common, DL, Yessur ETC)
Best rappers for their life in general
1. Kanye West
2. Eminem (When this crazy white boy actually calms down and stops pretending to be a gang banger he can spin a good rhyme)
3. Tu Pac ( I have like at least 100 Pac songs and yeah, he spins them all.
Most over compensating rappers
1. Necro ( alright beats, shitty lyrics, something is seriously whack about this kid)
2. Akon ( Has some sick beats but who is he kidding? He aint hard out!)
3. 50 Cent ( Why so much hate? I mean 'Piggy Bank' basically bagged on everyone in the game)
Anyway that is my VERY BIASED opinion but ya.