One thing I'll give Abrams; with Cloverfield he....well, we're in the age when we usually know most of a movie before we walk into it. And for the first time since...I was a kid, I walked into Cloverfield honestly trying to guess what the monster looked like.
So now, we have NO IDEA what Super 8 is about, or even particularly what genre it is. Is the alien being hunted? Or is it the enemy? What's going on?
He knows how to build this up.