I'll get this first out of the way: yes, I enjoyed the movie. A lot. I thought it was well done, well written, well acted, well directed, etc.
Most reviewers hit all the points, so I am not going to go there.
So now, to my point. This movie, together with so many recent blockbusters, contains images of the most rooted of all the american fears: the fear of wide-spread destruction and the end of our civilization, as we know it. Zombies and alliens are to Americans as Godzilla and other monsters are to Japanese people. And here is a disturbing thought: by dwelling so much in our feared images of end-of-the-world and self destruction, we may actually be moving in that direction. A bit, every time. Slowly and yet surely.
I dont want to sound moralist, cause I am not. I dont really care about good or bad. Everyone does as he / she pleases. But I care about gratuitous, unneeded movie scenes. I care about the intention or, perhaps, the lack of intention. And I feel that the movie is full of these void scenes whose only purpose appear to be entertainment just for the sake of entertainment.
There was this just one thing that did not click all right when exiting the movie theater: the realization that this movie is just a fabrication of entertainment based on the greatest fears of our society. Out there, life is not an enchanted house in an amusing park. Outside the movie theater, life is real. And there is just this fine line between reality and fiction, you know. You cross it and you may not be able to come back. You laugh one minute and the next, you cry. You play with fire and you are bound to get burned. Of course we are not talking about unreal creatures like zombies here. We are talking "mass destruction".
Just think about those NY terrorists and their Hollywood-like inspirations for their actions.
If I want entertainment for the sake of entertainment, I would just watch "America's funniest videos" on TV, in the comfort of my home or would just go and watch some silly movie. Hooray for the silly movies!
There is some kind of responsibility to society in making films. I feel that this human responsibility has bluntly been overlooked with this movie. Old fashion? Perhaps. I prefer to think that I just love life too much.