I mostly agree with Shamus, but I don't think that all "opinions" (or points of view) are equal. I will explain what I mean later in this argument.
::::Intro on Opinions
There are two types of opinions that I will refer to. One is an "informed" opinion. One is an "uninformed" opinion.
Before I say anything here I would like to point out that I think people, whether they have a "justified" or "unjustified" opinion of a game, still have the right to choose to buy, or not to buy a game, on the basis of the opinion they have. This is a fundamental "human right".
The issue here is not if the person justifies this decision based on an opinion they have, but whether the opinion they use is "justified" or "unjustified".
The only "justifiable" reason for disliking a game is based on an "informed" opinion.
::::"Informed" Opinions:
--Forming an "informed" opinion, contrary to the ramblings of fanboys, does not require you to actually play the game. It simply requires you to find out information about the game. The more facts you can find out about the game, the easier it becomes to pass a reasonable judgement on the liklihood of whether you will like the game or not.
--The opinions of other people can also help you to make a judgement of this liklihood. For instance, if the majority of people who have played the game like it, then there is a high probability that you will also.
::::"Uninformed" opinions vs "Informed" opinions:
I concede that neither of these methods are as good at helping you form an opinion of a game than playing the game itself, but games cost money and time. In that respect I concur with Shamus. However I disagree with the implication that "informed" and "uninformed" opinions of video-games are equally valuabe.
....... Why Informed Opinions are more valuable than Uninformed Opinions:.......
(1.--An "uninformed" opinion is one that is based on unreliable information, or none at all.
--In general, if you make any decision based on unreliable information, or none at all, you are more likely to miss out on something good, or cause something bad to happen to you.
(2.--Informed opinions are, as I have established, based on largely reliable information, and lots of it, meaning decisions based on these opinions are more likely to cause something good to happen to you, or lead you to avoid something bad.
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As you can see, decisions based on uninformed opinions result in more negative consequences, whereas decisions based on informed opinions result in more positive consequences.
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In summary, while I think that people have an interminable right to choose what they want to buy, it is ridiculous for fanboys to suggest that an informed decision on a game can only be made by playing the game itself. Good on you Shamus.