For me, I'd probably have to say the Ookami Kakushi anime. The last few episodes in particular are like watching a beautiful train wreck in slow motion. And when I heard Sentai picked it up for a Region 1 release, I pre-ordered it. At some point, I'm going to make my friends sit through the entirety of it from beginning to end and listen to my snarky commentary.

Oh, and Mirai Nikki. It personifies junk food, but I also have a bit of a soft spot for the manga since it was the first serialized manga I followed to the very end, and I do like the anime's attempts to make the story better in some places even if the end result isn't perfect. I'd call it "turn your brain off" anime, but why would I want to? Keeping my brain on is what makes guilty pleasures fun!