I'm one of those who truly believe that you can't make a true opinion about something unless you have experienced it yourself. So if people buy a game, play it through and then hate it, then I respect that opinion and think that it is actually worth anything. I've bought games and then found out I didn't like them, but I did so because I wanted to experience the game to be sure I have some solid ground in my opinion about it.
Like Angel said, there are genres of games that simply doesn't interest me. I cannot say with certainty that I hate those games, but I am indifferent about them because they simply don't attract me. I don't like shooters, so games like Call of Duty, Battlefield, Halo etc, they simply do not interest me. However, I HAVE played shooters I DID enjoy playing, such as Borderlands and Warframe, because though I'm not really interested in shooters, those games had other things in them that attracted me and made the games fun for me to play.
Another example is that I enjoy fighting games, but that doesn't mean that ALL fighting games are within my liking. Marvel VS Capcom 3 is a fighting game I don't really like all that much, except for a few characters, but overall, it just seems way too chaotic for me. And how do I know I don't like it? Because I actually bought it and played it. So I am 100% sure that my opinion about it is true. Not true in the sense that MY opinion is the only RIGHT one, but true in the sense that I can be completely sure about wether or not I like it.
What I find hypocritical is that those who hate on a game keep on saying that they hate it. Yes, we get it... You don't like the game. Now move on with your life or find something noteworthy to discuss. If I hate something, I can make note of it, but then I will simply move away from it and get on with my life, because if I don't like it, then it isn't worth spending my time on. But to continue to throw tantrums around about a game you don't like just seems like attention-whoring to me.