I think games should be reviewed on their merits not fanboyism or some sort of hate against one platform or another which is pretty obviously going on in alot of Wii reviews.
Also, reviews should indeed be based on the merits of the game. If Ubisoft makes an amazing PETZ title that is ground breaking but the reviewer doesn't like it because he isn't in the target demographic, that doesn't mean that he should pan it. He/She should give it the score it deserves based on the review criteria, keeping in mind who the game is geared toward. Anything else is just unprofessional.
Unfortunately, many gaming sites don't do this. They assume all their readers are Core gamers with similar values as them and hate on anything that doesn't fit their ideal model of what a game should be or what platform it should be on.
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