Why? Well let me tell you.
This movie was 2 hours and 40 minutes long. Most people have an attention span that cannot follow one minute commercials. Who thought people would be able to sit still for that long? I know what you are saying, Avatar is the highest grossing movie of forever and that movie was 2 hours 40 minutes. Yeah. No disrespect to that movie, I liked it a whole lot and am sure the Chief would call me an Ava-tard. That movie flows a little better and is not handling nearly the story load Watchmen does. It really gets heady.
The thing I blame most for the failure is the source itself. Watchmen is oft sighted as the greatest graphic novel. A creation that changed comics. Which it did. In 1986. The world of comics was very different back then. Hell, the world itself was very different back then. I really feel like people were slightly unimpressed with the movie because things have come since then and been more popular, really diluting the message and themes the book portrayed. I would like to know what the Chief and the Editor think about this subject.
Oh, and even though I did love the movie I didn't care very much for the book. It was hyped up beyond belief to me and I really was not impressed. I think, because, of all the comics and books and movies I had seen before reading it.