I consider myself a nintendo fanboy. Ive grown up with Nintendo's consoles and the only reason is that I believe that Nintendo have always led the way with innovation and creating 'new ways to play' and making overall fun games (wii mote, DS touch screen, analogue stick, portable gaming, 3D games that worked seemlessly - even bringing gaming to the masses by creating 'a games console').
However, this does not mean I Hate all other game studio's and wish the other consoles were damned to hell. I have a huge appreciation for what Sony and Microsoft (moreso the latter, which pains me as an Apple fan ) have done with their consoles this generation and what 3rd party studios have created on them. When I first played my mates PS3 on a brand new HD TV I could see they had achieved what they set out to do. Graphically, absolutely stunning and an incredible oppurtunity to create superbly immersive gaming environments. However, as nice as this was, I still felt Nintendo had created something new with the Wii. And overall, I have a greater appreciation for people who are willing to take risks to be different to what's expected for the sake of diversifying entertainment and making gaming fun all over again.
Saying all this, I always give a game a chance myself, regardless of what console, format, studio, genre of game, etc.
To answer the thread title's question, I believe both are true. There are huuuuge grey areas in the nintendo fanbase but it only seems to be the black and white that people notice. If a game (on any console) is fresh and exciting, and everyone had a chance to play it, I reckon 95% of people on this forum, and others would play it. The 5% of those who do wish every gaming studio would disappear are the extremists and tend to be the ones who make all the noise... They are the Taliban to the Nintendo Fanboy's Afghanistan.