Just someone that doesn't like open world games? There's people like that everywhere. Seems there are just some people who, when presented with a big, open world, just don't know what to do. So instead of trying out the story (an hour or two is NOT testing the story) they muck around in the world for a little.
Problem is, they haven't played enough missions/story to learn more about the game, and wihtout that knowledge they can't really appreciate what they can do in the world.
Fair enough, not to like that sort of genre, but it's all just personal opinion, and the writers arguments were hardly compelling.