I take it you're an MST3K/Rifftrax fan?

There was a 1961 film adaptation of Hamlet that was on MST3K once. It gets my vote because the production is so horrible I just couldn't watch it. I sat through Manos, I sat through Troll 2, I sat through Invasion of the Neptune men, but Hamlet was just too much.

But if you mean the worst out of those five, I'd say Manos.