Gamespot has put together a helpful list of rules regarding being a fanboy of one console or another. Some of the useful rules:

Innovation is what it’s called when your console has a unique feature. Otherwise, it’s called a gimmick.
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A sequel on another console is a “rehash,” while a sequel on your console is not; in fact, it’s highly anticipated.
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A person who owns just one console is inherently less biased than editors at GameSpot who have access to all consoles.
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[I]t is up to you to monitor how companies are doing and report every dip in stock price of manufacturers of other consoles. You’re all experts in the fields of economics and finance, so your analyses will always prove correct.

Putting together this list for MMO fanboyism would be a lot of fun. Might get me fired, though.