Anything I rate as a ten is one of my favorite shows. But that's like... just my opinion... man
Also, most of my ratings are somewhat influenced by my enjoyment of the show. (Not entirely but usually a small part)
I try not to rate stuff until it's finished but with some things it's clear to see the how I'm going to feel about the story, or in the case of manga/LN that haven't finished yet I rate them based on how I feel up to the point I've read.
Sometimes I'll start things back up in my dropped list, it being there just means that there is a very small chance of me ever finishing it rather than being totally dropped.