A lot of old people come to mind, but if we put age aside and just focus on how horrible their gameplay was my vote goes to Natalie from Redemption Island. I feel like she was actually playing to lose. It was a race between her and Phillip to see who could get the least votes, and Natalie actually won. If you lose to Phillip in a final three, you know you're shit at Survivor.
Can never win a Jury Vote because he's so damn obnoxious.