I have a recurring theme that the human brain is an unreliable piece of hardware. Seriously, meat-based information processing with no expansion slots? Another weakness of the organ is that we have trouble predicting how enjoyable, satisfying, etc. we will find something. How We Decide discusses how removing information can improve our decisions because we get distracted by details instead of focusing on what really matters to us.
Another potential way to improve your decision-making is to outsource where relevant and convenient. While you may have trouble predicting your outcomes, you can look at those similar to you and see how they rated it. If someone with similar movie tastes to you does not like a film, you probably will not like it either, no matter how excited you are about that latest sequel. Hence a use for our gamer blogger peeps: if you usually enjoy the same games that X does, and X says the beta is going horribly, cancel the pre-order.
It seems that most people read and comment on reviews primarily to engage in religious strife about whether some upcoming game they have never played is the messiah or the devil, but if you are planning to spend more than 100 dollars and hours on something, it might be worth availing yourself of useful heuristics.
No, the study is not a slam-dunk. The sample is WEIRD and the size is not huge. But it does agree with a body of research on failures in self-prediction. You would think you would be able to predict yourself better than anyone else, but no.