Watchmen.
Cult-classic or not, I thought it was absolute crap. The storyline on the back of the box says: "Someone is killing superheros and these guys are going to find out who and why."
There was only one superhero officially murdered, the others just ended up dying while fighting crime. There is absolutely no relation to the primary story except in the start, and the end of the movie. Most of it was just mundane people trying to relive their glory-days as superheros, a whole bunch of nonsense on the flaws of humanity, a lot of very corny sex scenes, people exploding into gooey, Jell-O looking bits, and blue penis. Lots of blue penis. I'm gay, and even I think that was a point against the movie instead of for it.
I only watched it through because I thought maybe it would get better towards the end. It only got worse, and worse...and worse...until I was finally happy the movie ended, so I could watch something else to keep from shoving the DVD down the director's throat.
Ugh..