One thing that's come out of it is that I've stopped procrastinating the manuscript I've been editing for several months. I'm not working on it in big chunks, but I am working on it in bits and snatches every day now; making progress. The next step will be finishing a chapter and sending it off to the author with the note that, in my opinion, his work sucks and I have done what I can to make it passable but that it is no longer worth my effort to try and make him look good.
It's harsher than I would have been a month ago, but it is what I feel. If he wants to put in the effort to make it better (I'll also say in the note) I'll be happy to help. I'm tired of feeling bad about putting out a piece of junk to the point that I've avoided working on it.