I've always thought it was strange that people expect that someone who turns out to be Darth Vader to be the nicest, most well-behaved, stablest teenager ever. It's weird.
I have to question the credibility of people who list prequels not yet made as the worst ever, but anyway
. I would go with Home Alone 2, although I can't speak for Home Alone 3 because I never saw it. And Weekend at Bernie's 2.