Here's a random topic that popped into my head (we may have done this sort of thread before, I don't know, but it seems like fun to revisit either way).
Are there any notable critical flop movies/games/books/etc. which you actually, genuinely enjoy? So-bad-it's-good, or with Rifftrax doesn't count, I'm talking about a movie which you genuinely enjoy the way it was intended to be enjoyed, despite critics and/or audiences considering it to be a disaster (and while stuff like Blade Runner that was critically hated at the time technically counts, it's not really in the spirit of the question).
I'll start with a couple of my own:
This one's kind of weird, because basically the only place I remember hearing good buzz about it was on io9, which seemed to kind of like it. Push was a movie from 2009 that is currently sitting at a 22% on Rottentomatoes, but which I really, really like. If you haven't seen it, it's a "what would people with superpowers actually being using them for?" type story, which we've seen a million times. The thing I actually thought was cool about it was the setting, Hong Kong, which gave the film an absolutely incredible visual style, filled with bright neon colors on dark, wet backgrounds, actually kind of like we just saw in Pacific Rim.
Also, some of the superpowers actually seemed pretty unique, like one of the bad guys who could sort-of see the future. She could what routes intentions of others would lead to. So, for example (I haven't seen the movie in a while, so this is from memory), if you intended to cross the street, she could see that you would be hit by a bus if you did, but if you changed your mind and decided to go down the block instead, then she would see you safely cross the street.
I swear I'm the only person who actually really enjoyed Speed Racer. It seems like it's been built up into this legendary dud, and yet I saw it and thought it was exactly what it needed to be, completely over the top, practically a cartoon, and yet a whole lot of fun. There's really not much more to say about it, I just enjoyed watching the races, and seeing the absurd hot-wheel tracks they had designed these cars to race on. The plot was competent, the acting ranged from decent to good, and the action was a lot of fun. And yet it's at a 39% at Rottentomatoes, and I only ever hear it mentioned in a negative context.
Edit: I thought of another critical flop I really love.
Last Action Hero
Widely considered to be one of the lower points of Ahnahld's career, Last Action Hero is an action-comedy making fun of it's own tropes by exaggerating them. And I happen to think it is, for the most part, hilarious. There's a few lines here and there which don't work, but around the point where Arnie starts swimming through the La Brea tar pits, and the sidekick remarks "you know, tar sticks to most people," I decided that I loved the movie.