I love loooooonnnnggggg fanfics. I do't usually have time to read it all at once, so I finish them in my spare time.
I have love shipping fanfics, as long as they have a good plot, good grammar, a shipping I like (duh) and I hate OC x Canon Character stories.
I also hate it when someone stopped writing a fic, just when I was hooked on to it. The situation is so dire sometimes, I have to make up my own endings to keep myself from... I don't know.