First he tried to avoid the subject:
Hey Watchmen fans! Yeah, that's right, I'm telling you what you should care about in Watchmen!
Hey Watchmen fans! Alan Moore was right!
From what can be assumed, the squid was deemed too 'weird' for movie-going audiences and was dropped in favour of nuclear explosions. Explosions still kill millions of people right? What's the problem? The problem is that Zack Snyder doesn't understand the source material he claims to be such a fan of. The death of millions isn't the point. What causes it is. If a superhero that the entire world hates and fears kills millions of people, why would that stop war? It would galvanise the entire globe's population into picking up more guns and hunting down all superheroes and their families. And anyone else who gets in the way. Fear and hatred would increase ten-fold.
But if millions of people are killed by the sudden appearance of a alien species, it's natural to believe that the human race would stop shooting at each other to fight this new threat. And since the alien is fake, the human race wouldn't actually end up fighting anything but the amazement and general feeling of we're-so-small-in-the-universe-let's-stop-fighting would remain.
In the end, it's extremely disappointing. On one hand you could say the film doesn't matter. You've always got the comic (which is awesome) so just ignore the film and don't go see it. That's a good point (and it is what I'll end up doing) but it's not that simple. If Zack Snyder wasn't so adamant about making Watchmen extremely shot-for-shot and word-for-word faithful (and the trailers for the film are evidence of this) then fans of the comic wouldn't be asking...WHY? Why change the ending if everything else in the movie is exactly like the comic?
If the movie version of Lord Of The Rings had Frodo kill himself at the end, why make it?
Hey Watchmen fans! Fuck you!