Hmmmm, let's break this into three sections.
Manga: Golden Pair
Anime: Anything with what's his name. (that could hold for the manga too)
Musicals: From the ones I've seen.......hmmm........can't think of one. *grins*
I guess my all time least favorite would be anything with what's his name. It used to be with Atobe, but I actually found some well written pieces with him and gave them a chance and liked them.