Judging by the comments in the TR article, not too many people seem too upset by this. However, I'd like to give my two cents worth on the issue of the revised Watchmen ending, and if you don't like spoilers, don't read any further, unless, you know, you've read the damn thing.
In the graphic novel, the ending arrives in the form of a hapless Night Owl and Silk Spectre witnessing the deaths of millions of New Yorkers at the hands of the psychically exploding giant squid/alien creation of Ozymandias (if this sounds in any way weird, please, you have to read Watchmen. It is truly, the best graphic novel ever produced, and Alan Moore is a genius, and Dave Gibbons is a master illustrator). However, according to the people who saw the test screening of next year's most anticipated movie, Zack Snyder swapped the mind-blowing squid with a series of nuclear explosions on major cities brought by (what??) Dr. Manhattan, who was apparently convinced by Ozymandias into doing it.
What. The. Eff?
My main caveat would have to be the subplot of Adrian Veidt anonymously hiring the world's foremost creative artists to engineer the creation of the squid/octopus/what-have-you being cut out or altered. This basically means that this plot point probably won't appear in the movie, since it wouldn't lead anywhere anyway. Which is a shame, since the mystery behind it that was featured in the comic played such a big part in the story. On the other hand, either ending probably has the same effect, i.e. uniting all the people on Earth against a common enemy. So, in the graphic novel, it's aliens, and in the movie, I guess it's nuclear weapons proliferation.
But, hey, I guess we'll have to wait and see how it turns out in the final cut. I'm definitely still going to love it, because Patrick Wilson is playing Night Owl, and David Hayter cowrote the screenplay, and based on the set photos, which look incredible. Oh, and Malin Ackerman (aka Freakshow's wife from Harold & Kumar) is Silk Spectre (hot!).