I'm looking for ratings of opening and ending animated sequences (aka OP and ED). Usually an anime has multiple OP and ED sequences for each season and sometimes even more than one of each per season. It would be interesting to compare the ratings with other viewers.
I've seen rating sites for anime characters, character songs, music videos and soundtracks, so I suppose there must be some for OPs and EDs.
You commented that you are looking for something for something rating the animation as well as the music, and I don't know of anything like that, but Gendou's Anime Music site is a good reference for finding opening music based on anime title and for rating the songs themselves, so I figured it was worth a mention at least.