It's all about the symbolism. If you didn't like this movie, then you missed the point. Symbols are all around us and relay a message. Movies have in symbols in them too. But this movie had symbols all over the place. Masks, rainbows, the lighting, the colors. It's not just artistic license here, everything had a purpose.

In the beginning of the movie Tom Cruise is at a high-brow party. He and his wife are doctors. Doctors are about as high up as you can go in regular society as far as respect goes. These parties tend to have doctors, judges, politicians, celebrities, etc. This is nothing new, but when he went to that other party it was a whole new world.

"I know what happened last night," he continues. "I don't think you realize what kind of trouble you're in... If I told you their names, I don't think you'd sleep so well."

Doctors can pretty much go anywhere but this party, he was in trouble just for going. Because of what he saw. Everyone was disguised so no names were known, so how could he be in trouble just for going in disguise? He could never turn anyone in. What's the problem?

Because it's not just a sex party. He was to be killed just for going and the girl who overdosed, was murdered. Not an overdose. It's pretty ill because nothing is as it appears hence the ending. This movie was great. But it goes over a lot of peoples heads because it goes into subjects that are openly discussed. So unless you've studied some of subject matter, it would come off as a boring stupid movie.


IMO Uri Dowbenko breaks it down the best in his review:
http://www.umsl.edu/~thomaskp/offline7.htm