You haven't seen it yet, for one. (Why am I surprised that you've judged an entire film based on one trailer?) For another, generalfrevious said "based on" an old movie, which Super 8 is not.
My point stands: there are plenty of unique films being made. Not including the wealth of indie films out right now. It's more than a little untrue to say that no one can name a movie that is not based on a franchise, an old movie, or a comic book.