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vivster said:
There are too many games on the market to even try games you're not fully on board with. I know what I like and what I don't like and I buy accordingly.

You could argue the same about movies or music. However, in certain circumstances, in which you would otherwise avoid said movie or band due to having a poor impression - a friend might suggest watching a movie you were on the fence about, or introduce you to a musician that did not interest you. You do not necessarily have to actively seek out things that you believe will not interest you.
In these cases, you can encounter something that you were reluctant to participate in any form of engagement, and come to find that you have enjoyed said things.

I often have a greater sense of satisfaction out of discovering something that I wasn't expecting to like, rather than encountering something that I knew I would like. 
I also find that if I believe I am going to like something and I am disappointed by it, I am more disappointed by the thing that I thought I would like, than that of something I already had low expectations for.