Loyalty and bias, the tenets of the fanboy, aren't something that should necessarily be looked down on in every environment [...] Whether or not you buy into Nietzsche's assertion that there is no absolute truth, it's hard to deny the fact that we all have our own personal biases. Whatever fact or truth may exist, we inevitably see it from our own unique perspective. This bias is unescapable, a product of our own individuality and capacity for free and original thought. Everyone has different needs, priorities, and experiences which dictate the way they see the world.

Fanboyism is great. People who are overzealous about a product often bring up compelling arguments that only someone blinded by love could look hard enough to see. (Yeah that was strange... blind looking?)