I know this is locked (but I'm going to unlock just because I'd like for this to continue in a civilized manner... and I want responses to my questions).
I'd like to state my own opinion on this film as I've never read the book and I was not familiar with Watchmen in any way shape or form. All I knew going into the movie was that it takes place during Nixon's presidency and that apart from one character no one has any super powers. Also, I was told not to expect a typical action film but one with narrative and meaning.
Overall, I have to say that I enjoyed it, but while I feel that I did keep up with everything that was being thrown at me, in the end there are a few things that just came out of nowhere that left me puzzled.
1) WHAT THE HECK IS THAT TWO-HORNED TIGER? AND WHY DID IT'S HORNS DISAPPEAR AT ONE POINT IN THE FILM? Ok, so the film explained the reason for Doctor Manhattan's creation which was good, but then to have this strange mythical creature show up without any explanation was so random to me. It actually distracted me from the ending of the film as my mind was trying to figure out what the heck this thing was. All I got was that it was Adrian's pet, but I maybe way off base here.

2) Why were the scientists there at the Temple with Adrian killed by him? Is it because of him using this technology as explosives around the world and he didn't want them to witness it? You see, when he fried them in the same manner that Doctor Manhattan was created I immediately thought that he was creating equals to Jon to be able to rival him. It didn't make any sense though (because then why wouldn't he just undergo the procedure himself?) but that's what I thought given the manner of their execution.
3) What the heck is the point of the Egyptian-like temple? The whole location was beautiful but why was it created like that? And why did Adrian develop a liking to the Egyptians in the first place? In the film he likens himself to Alexander the Great, so this whole Egyptian-esque setting at the end felt so random to me (as well as the Egyptian literature at the Pyramid company). (lol, only now do I get the connection between Egyptian stuff, and Pyramid. HAHAHAHA)
4) I was kind of confused by this Pyramid stuff and the conspiracy. It's sad I know, but I didn't get the connection that Adrian was the "bad" guy until the beginning of the scene after the file is discovered on the computer. There was something about Veidt and I just couldn't remember that company name, so it wasn't until the next scene showed Adrian that I put two and two together. In retrospect I think the film could have put more emphasis on his company early on and repeated it another time so you don't forget. All I got out of it during the film was that Adrian was the only Watchmen who revealed his identity and created a company that sold action figures. (So random...)
I liked the beginning of the film that revolved around the Comedian but then once that was over the story kind of fell flat for me. I think the scene where they rescue the people in the burning building was kind of weak and pointless. Also, while I thought the night vision goggles were neat, since they were never used later on what was the point in showing them? I take it some scenes must have been deleted (but then they should have deleted this as well)..
5) WHY THE HECK WAS A MAXIMUM SECURITY PRISON SO OVERRUN IN THE FIRST PLACE??? This came out of nowhere. It was very Prison Break-esque, but at least the Prison Break riot made sense and was orchestrated specifically for a purpose. In the film it was just a little too convenient as a plot device. One scene we see Rorshach (sp?) being put in this maximum security prison, and in the next scene everyone is outside their cell rioting EXCEPT him as his cell is still conveniently locked. WHAT THE???? I was very confused by that.
6) I don't really feel that I understood the neat looking contraption that Doctor Manhattan was making on Mars. Looking back I get that he has a background with watch making, and the machine he was building was very mechanical like a watch, but I didn't grasp why he was making it, or why it broke when it was punched... I'm sure there's some deeper meaning to this, but I don't think the film brought it out. It felt more like, here, look at this awesome contraption.. now look at the awesome CGI as it shatters! It felt very "The Fountain"-like.
I'll end this post by saying that I really liked Rorshach and his character. I felt that was very strong. The rest of the characters were a little weak. Doctor Manhattan would have been a lot better if they showed him as an ordinary man for longer and showed his personality traits, and then allowing us to see how his becoming supernatural changed him, rather than just saying at the end "Oh, Adrian used his psych profile to manipulate him!!" and leaving us to guess at how he was before his conversion.