Not only does that have nothing to do with the quality of the game, but I doubt you can even prove that. The people I play TF2 with certainly emjoy earning achievements when it happens but are not playing just to get them. And even if they were, that is completely unrelated to the quality of the game.
Maybe this should be titled "I don't like achievements" and TF2 might have some relevence in the discussion, but TF2 was high quality when it was released and has enjoyed some of the best support from its developers that a game could ever hope to have.
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