I thought that 50 Shades was just bad, but I didn't know any of the details.
The trailer, if anything, makes the story look depraved, and reflects badly on the author. I mean, a person who just uses others for sex being the main love interest is f**ked up. Since the writing of the source material is abysmal, this looks like it might not even turn out a "ha-ha, it's so bad" movie, but more of a "oh god this is so bad, why does it exist" movie.
The fact that it comes out on Valentine's Day doesn't make it better either. I mean, Twilight was already pretty damaging to easily-influenced people, but this is bordering on smut-peddling territory. I believe in the lack of restriction for art, but this still feels like it should be regulated somehow, or at least have a warning label attached to it.
I mean, even The King in Yellow had some warnings saying "this book here contains f**ked-up s**t, be warned, reader, for you venture into madness".