KANYNE? He's garbage, how can anyone think he's even top 500. He might be a good producer, ive heard (idk the difference between good and bad one) but as a rapper he's so bad xD
But if someone likes him then no problem you can like what you want but srsly though.
Anyway i agree with the thread-starter to some degree, many underground rappers are trash but you cant really say that X is better than Y because he is/isnt underground. There are lot of good and bad UG-rappers, like lowkey or eyedea (if you like that kinda emo-shit). One thing i like about UGrappers though is that they dont have to please large audiences therefore i dont have to put up with shitty first singles the artist made to get sales.
Also i think that these "rap-pioneers" like rakim or kool g rap are overrated but that's another story for another topic.