All I can say is this
From reading the reviews People either loved it or hated it.
From the people who hated it, most saw the trailer and had a general Idea of what it was about.
From the people who loved it (including myself) most had no idea what this was about, had no expectations, and were really pleasantly surprised.
After seeing the low rating, I watched the trailer. It paints the movies completely different from what it is. It also [spoiler]gives the impression that Arnold is in most of the movie which probably one of the reasons many came to see it.[/spoiler]