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'As a final note, a 'you can't reply to criticism to your game' rule
would stop a lot of flame wars here. Then again, it would also give trolls
who just want to hurt people's feelings more power.'

Which is why it shouldn't be strictly enforced - the Internet is much
more open than a small room with a dozen people in it and so there should
be a little leeway, or an option to disregard the thing altogether.  And
besides, if a game is truly good, it will show through peoples' opinions,
not through some interweb troll's offensive comment.