Pitched one for the first time a few months ago. I took a class for OBW through the guild I belong go. Fortunately, there was no charge for the class, and I got the fabric on sale.
I had all of the rows done, it was on my design wall for weeks, but I just hated it. At first I thought it was the fabric I used, but I've since looked at lots of them and I just don't like them.
After a while, I just decided to give myself permission to pitch it and that's what I did. Didn't try to save any of the fabric, just tossed the whole bit. Ahh, a weight off my shoulders!
I have done a few mysteries, and some I ended up liking more than others, but I've never disliked it enough to toss it.