So let's talk about novellas. Some people hate them, some love them.
Personally, I'm a bit mixed.
First, I don't like the extra money. They're usually only ebooks so I can't even add them to a physical collection.
I LOVE the extra information we get. The Throne of Glass novellas for example, those are awesome! Love them. They tell us a story that isn't exactly necessary to the series, but add so much more to the characters.
I just finished the Daughter of Smoke and Bone novella, "Night of Puppets and Cake". It was a perfectly hilarious and adorable read. Not necessary to the overall story, but a bit more background to a couple of the characters.
Some novellas change how you feel about characters completely. (Shatter Me, for example.) I don't care for those as much. If you wanted me to hate/like the character to begin with, that should probably be in the main book.
So... What about you? What is your opinion of novellas? Hate? Love? What are your favorites? Let me know in the comments!