Everyone has their favorites, but you rarely hear people talking about their least favorite. For me, there are three:

Axanthic: I think they're okay, and have seen some nice ones that have very little brown, but they seem to get more brown the older they are.

Hypos: I know it's a favorite for a lot of people, but the "average" hypo just looks like a ball that's getting ready to shed. Doesn't do much for me. I do like many of the hypo crosses, though.

Spider: I love the top half of the snake, but the white blotchy scales on the bottom turn me off. If only they can find one in Africa that models the pinstripe, but with the spider pattern.