I gave up giving Amazon reviews more than a cursory glance ages ago. I can see where someone might have a cynical reaction to the "Verified Amazon Purchase" tag, but at least it lets you know the writer actually owns said product. Too many reviews on Amazon are shills.
And as for this, I think people are hoping to do like the PC gaming people did with Spore and some other games where they loaded the Amazon reviews negatively in protest of the DRM scheme being used. It did cause EA and others to rethink their DRM, so there you go.