Straightforward and Action Packed

This is not an avant-garde, experimental film—it's a blockbuster, and so you're dealing with lots of special effects, models, and CGI. Hey, there's a reason it got the Oscar for Best Achievement in Visual Effects, right?

As far as narrative point-of-view, same thing: the film isn't super complicated. Sure, we follow a few different (related) storylines, but the perspective remains firmly with the "people fighting the aliens" as opposed to, you know, the aliens. The narrative and camera never follows the aliens around or gives us insight into what makes them tick; when we see them, it's in the context of an earthling trying to figure out how to deal with them.

What's the point of that?

Well, first of all, it's scarier, and it builds suspense. We get to spend the first portion of the movie kind of wondering what's going on along with the David, the President, and the other characters.

Also, this technique clearly sets the aliens up very clearly as the bad guys. The narrative's focus on the earthlings suggests that we don't need to bother trying to understand the aliens—all we need to know is that they are bad.