Award Snub: "Rainbow Connection" lost to "It Goes Like It Goes" from Norma Rae. Critics and fans alike let the Academy hear it. And who even remembers the other song anymore?
Also, he has a bit of a following in Japan, where all of his old albums have been re-released before they ever were in the west. He even recorded a live album in Japan.
Tastes Like Diabetes: A common complaint lodged against his music, starting roughly around 1974 with the release of A Little Bit of Love. Williams himself acknowledges this.