Ikael said:
really. its almost the exact same except the ending is much better.
And by "better" you mean "shittier and with less of a grey moral area like pretty much everything that Synder touches", right?.
By "better" I mean no more utterly-destroy-your-suspension-of-disbelief-with-a-"creature-from-outer-space"-retarded-ending.
and instead replaced it with a "BETTER" ending that sensibly included a character you were invested in.
to quote a better writer:
http://www.chud.com/articles/blogs/1608/Why-the-Watchmen-Movie-Ending-is-BETTER-Than-the-Book.html
Now, on to what I imagine will be controversial. Why is this BETTER than the book's ending? Here are my four reasons:
1. The book's ending planted a dead "alien" in New York. You could imagine that alien body would eventually be taken by scientists, poked, prodded, and possibly proved a fraud. In the book Veidt dropped a specimen in New York, and who knows if it could stay "real." Now, the idea that Dr. Manhattan bugged out to Mars, is a bit off his rocker, then struck the Earth out of displeasure is scary because there is no way to know where he's striking from, or if and when he'll stop watching Earth. Veidt may need to do one of these fake alien attacks every decade or so to keep people on their toes, but the unseen overseeing wrath-filled God that everyone now believes in goes a lot longer. In the movie, Nixon closes his televised address not with "God bless America" but with "God bless us all"...that summed up the global shift in thinking in a fantastic and subtle way.
2. Less mess. This was in a way a more graceful ending from a plot perspective. Sure, in a way the "squid" really took the book to yet another level of strangeness that is actually quite remarkable, but the movie succeeds is creating an ending that is centered more around the characters already in play. In other words, instead of something coming in at the ending from left field, this is coming from the psychology of a world dealing with an entity like Dr. Manhattan. Dr. Manhattan...er...GOD is watching...behave.
3. How many different explanations of the squid do Watchmen fans give? If you really quiz some fans, you realize quite a lot can't really re-explain how the "alien" actually killed the people in New York. For as much as people love the ending of the book, I don't think many can explain it very well. A good example of this is a slashfilm.com audio review I heard in which Kevin Smith asks three others on the review to explain specifically how the "alien" killed so many people. No one on the review got it right. There are some great things about Moore's ending, but that was a good illustration on how confusing it is.
4. It's all in the journal. I would argue the "alien" trick in the book could be proved a fake two ways: by people closely inspecting the dead "alien" and by Rorschach's journal. And in the movie ending, with people believing Big Brother Dr. Manhattan is watching from who knows where, it really comes down to Rorschach's journal alone to reveal the truth.