Dave Krieg is not a bad jersey. He might have been a jerk in real life, but the guy was a really good QB for what he had around him. Also Rufus Porter was another guy I would love to have his jersey.
Now bad jerseys....as a kid I had a jersey with the name Stan Gelbaugh on it. Believe it or not, he was a QB - I think about the time we had Mirer but the pain of Mirer was so great I blocked most of those years out so who knows. (Though we got Big Walk for him later...)
Ken Lucas, but he was pretty good for us back when we still had low standards for DBs.
Also not purchases but gifts:
I had a Maurice Morris jersey, someone gave me his Hawk jersey because he went to Oregon and being a Husky I had to hate Oregon but then cheer for him once he became a Seahawk.
Someone gave me a Tuten jersey, even though wearing a punter's # kind of seems off unless you are related to him or something.
(And I also have a cursed Marshawn Lynch jersey that I can never wear.)