Yep, I wouldn't qualify myself as a huge Alan Moore fan, but I have a few of his books (Watchmen, V For Vendetta, and my favourite comic book of all time, The Ballad Of Halo Jones), and he is fantastic. I thought Watchmen was a little over-rated, but it was absolutely great despite being slightly under-whelmed. You're right about the artwork, too; Certainly the thing I remember the most.
I'm interested to see the film based on it. I tend to avoid films based on comic books, but my friend described how they got out of the alien scene near the end of the book, and it sounds intriguing.
Going to re-read "The Dark Knight Strikes Again" soon, and hope that lowered expectations from reading it a while ago work for this one, too