Based on the "everything you need to know" article, it sounds like the underappreciated thing with respect to GFK was said because storf's friends didn't like GFK as much as him. So of course he takes his limited personal experience and applies it as a weird absolute:
"And then when the Rap Internet came around, you could acknowledge that Ghostface was this incredible rapper. It was this weird era where he finally puts this Fishscale record out in 2006, and it was this huge moment: Finally, Ghostface fans were OK to say “Ghostface is the best” in public."