I like Trophies, personally. They're neat, and it gives you an extra sense of satisfaction when you do something and don't even realize you were getting a trophy for it. That being said, I've still never Platinumed a game because I'm not going to do something I don't want to do for that Platinum trophy.
But I don't get why people get upset about it. If you don't care about Trophies, it doesn't affect your enjoyment of the game at all because trophies are completely supplemental.
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