I have to disagree with you dude. None of these movies have been about the villian, nor should they be, even though that's what they're named after.
And a villian is nothing without a fleshed out hero.
We can accept that the Terminator does what it does because he's a machine, we can accept that a Pred does what it does, because it's a Pred. We can accept that Aliens do what they do because they're alien. But the hero, being human, must have motivation that WE, as the audience agree with and "feel". When we go to a movie, we're not there as the villians, we're there as the heros. Feeling (if it's a good script) what they feel and going through the emotions they go through. These movies would fail MISERABLY if they soley focused on the non-hero aspect.