Notorious B.I.G.
THE MOST OVER-RATED rapper of all time. Considered as the best of all time by idiots who can not look past the east-coast/west-coast feud and just seem to like the man because he was from Brooklyn, and conversely, fail to recognize Tupac's genius because he repped the West Coast. Tupac, the true best rapper of all time, was also from NYC, but location has nothing to do with the caliber of the music.
      Biggie had a total of Two albums, one of which was total shit (Life After Death). You'd think the best of all time would have a more impressive catalog in order to deserve that title. Even if you think that Pac is not the best, there are at least 10 rappers who are far better than Big: see list below.
    But let's look at the music we do have as a basis to make a judgment:
-Biggie had the misfortune of having his work sullied by one of the most untalented producers to ever walk this earth (Puffy, who makes a semi-retard like Mace look like a lyrical genius). 
-Had some of the wackest, and I mean mind numbingly dumb, lyrics, to be ever laid down on wax: 
-"Escargot, my car go" (seriously, he said it). 
-"B-I-G, G-I-E, AKA, B.I.G. Get it? Biggie" No, I don't get it. It's not like you spelled it out or anything. 

    Biggie, in contrast to Pac's complex rhyme structures which includes internal rhyming, was tied down to the "I have to make the last words of my sentences rhyme at all costs", and his lyrics suffered for it. 
       Example: 
Birthdays were the worst days 
Now we sip champagne when we thirst-ay. pure genius, rhyming days with thirsty. 
       -And many many more examples...
     Not to mention that thematically, Biggie was a prototypical ganster rapper that did not stray from the de riguer themes of ganster songs (guns, hoes drugs, violence, repeat for each song). Pac's work, on the other hand, speaks of a wide range of themes (black on black violence, child abuse, police brutality, fatherlessness...in addition to the guns, hoes and violence). 

"Ready to die" deserves its place as one of the best rap albums ever. 
"Life After Death" bears a heavier influence of Puffy's production and suffered for it. These two albums (three, if you count the latter as a double album) does not equal Tupac's "All Eyez on Me" alone. That's as far as it goes. Let's not get carried away and call Biggie the best of all time. This appellation, despite the mediocrity and small quantity of the man's work, is what earns Biggie the real title of "MOST OVER-RATED RAPPER OF ALL TIME."

Better MCs:
Pac (exponentially better).
Nas
Jay-z
Rakim
Dr. Dre
KRS-One
Ice Cube (exponentially better).
Kool G Rap 
Chuck D
and many, many others...

Notorious B.I.G. is the illiterate retard's rapper of choice.  B.I.G., aka, Notorious P.I.G. when food was around.
