There's a reason most Comic book geeks RAVE about it. A couple things though: this is not light reading. You're supposed to study every single panel of every single page. And read every single page. They're all there for a very good reason. I've read it at least 20 times and I've literally seen something I hadn't noticed before... Every time.
The story is less important than the emotional contrast between the characters. The only "superhuman" is the Blue Guy from the movie. He's a changed character from an expired comics property that the publisher allowed Alan Moore and Dave Gibbons to interpret literally.
-What would happen if a guy lived in the continental US, and he was literally a god in the form of a glowing blue man. (Ex: He can take a Tank about into every single nut and bolt, just by thinking about it.) And, he was decidedly American. For starters, we beat the Russians into Space, and most of the NVA that aren't killed outright instead choose to surrender to Dr. Manhattan personally. Basically: everyone is very, Very, VERY scared of the USA... (That's a good lead in.)
Suggestion: this is a 18-19 year old reading level. I read it in college. IE: don't give it to your 12 year old son. It has sexually explicit content, exceptional violence levels, and the Blue Guy is 100% naked for most of the book.
If you're an older fan, you have no excuses left. Read the book. It's like the flag that nerds wave to prove that Comic books are literary.