Yo I is a G I see your point
BUT I personally think you missed a key element on what I think you are dissing rap, whistles, claps, bass kicks. Unless you are making fun of Soulja Boy, then for that, I give you a 5/10. Like the other guy that gave you a 6, it at least gotta have a little more talent.
Mos Def is great for actual rap, whereas soulja boy is a joke and needs to be shot. If your perspective is for the style of Soulja Boy and the other jokes, (Walk it out), then I would give you a higher score. I think my 5/10 is good enough.