The trailer already has Dr. Manhattan pretty close to nude (which seems to be a big deal for you) and the Comedian smoking a cigar (in Vietnam no less).
Zack Snyder (director of 300) used the comic as his storyboard and even brought Dave Gibbons in to assist with artwork. While we all know there isn't a chance in hell of this happening, Mr. Snyder has said that his ultimate goal is to make a film that Alan Moore will watch and thing represents the comic.
Is there a chance this movie will fail, and horribly so? Of course. I'm not going to be that jackass who doesn't give it a chance though. Watchmen is one of my all time favorite works of fiction (not just comic), and I will be very disappointed if it sucks, but if it doesn't then it will introduce that many more people to the ideas and world of Watchmen, something which I think is a good thing.