Worst GUN (an that's stretching the term) was a German luger look alike made by Erma in .22 cal. This was over 40 yrs ago, so some of you old timers may have heard of it. It would take me a least an hour to shoot a box of 50 rounds because of jamming. I don't think it ever fired over 2 rounds without jamming. The friend? I bought it from still laughs about that POS. I don't know what ever became of that company, but I hope it's not still of this planet.
Like Ibwar, I can't remember ever owning a gun that I hated. When I got started, late in life, my late 20's, I researched. That meant reading lots of books and magazines. I started with a Ruger Security Six. A great value for a rock hard revolver.
With the internet, I don't believe companies (you know who I'm talking about ) that produce pure crap can stay in business.