I like and will happily rewatch rom-coms or high school comedies like Dirty Dancing, Mean Girls, Clueless, Breakfast Club, Definitely Maybe and I could go on for a while, but I wouldn't call any of those bad. Same with series like Gossip Girl and Pretty Little Liars - sure, they're rather soap opera-like with insane plots, but they're well-made (except maybe the first couple of episodes of PLL, to be fair...).

Although I guess I did see all the Twilight movies twice, you might say those are bad. Kristen Stewart is a fine actress but there's only so much you can do with that source material. And on a semi-related note, I once tried watching Fifty Shades of Grey but gave up halfway through.