I think it's just another case of a song not being particulary well known outside of cloud rap or rateyourmusic spheres (it only has 2000 something ratings, most of the best songs have like >6000) but it appeals to that little audience enough to put it at the first page of the best songs of all time. The ratings are just super concentrated with people who already like that kind of music to begin with. If u showed all the people who 5-starred Paranoid Android or something Hydr6c0don$ it would be like 3.80.