Didn't know that it was so bad.

Or you could try watching the movie yourself and deciding how you feel about it instead of just going off of IMDB or RottenTomatoes ratings.

Lassoing and swinging from lighting bolts. Jets that fly at 30 mph.
The film is loaded with playground physics that only the "it's just a movie (or comic book) so why take it serious?" can possibly enjoy. The good capeshit movies out there are the ones that take care to not be too silly. This one doesn't feel like it is made for kids. It feels like it is made BY kids.

If you liked the Burton or Shumacher Batman movies then you might like this. Or maybe my opinion just boils down to "hate pile-on." Yeah. I like joining the crowd when the crowd hates something. I don't have my own tastes nor right to vent them.

If you personally liked it, then it wasn't "so bad" to you, no matter what critics or other online reviewers say.