I find myself sometimes waiting until a fic is complete for the same reason - in case there are things I need to skim, or if it hits one of my squicks (there was a WIP I sarted reading and commenting on until it turned into a very graphic rape-fic and I couldn't continue.)

If there's too much to squick about in my story making it hard to read, I totally understand that. At least it was given a chance and that's all I really ask.