While it wasn't the greatest thing, I wasn't disappointed in the ending, and I didn't think it was 'dumb'. It was certainly better than say... Assassin's Creed 3's. That one was bad. Furthermore, Isaac isn't some kind of chosen one to do these things, he was just a guy in the place, and since he had experience and a past with all of this, that's why he's there, pretty much. I disagree with anyone that says Dead Space doesn't have a good story; when compared to many games, that's just BS.