Nintendo has done a really, really shitty job to serving their customers this gen. They've always been indifferent to many industry trends, but its getting ridiculous the way that they're almost stridently going against the grain.
What was Nintendo's big holiday release? Wii Music. Would people have gotten as angry about that if they had brought out anything else along side that, anything else so at least the only option from the 1st party publisher wasn't a miserably done music game? Probably not. Not bringing out the so very many DS and Wii games to America that they very easily could is infuriating, especially in the absence of anything else to replace it.
NOA only seems to be too happy to kick back their feet and reap humongous profits off of software that can barely be called games. Meanwhile, their longtime customers, people like me who actually bought a Gamecube and such are being shut out in favor of the new demographic, the one that doesn't give a crap about anything that isn't Mario or some other cutesy/pseudo practical shit. Considering the massive piles of money that Nintendo is making on the Wii, it just seems kinda mean not to better cater to the long suffering audience that kept them afloat during the last decade previous to their current success.
The Wii is the first Nintendo console I've owned since the Super NES where my 1st party games are dwarfed by the 3rd party stuff. And the Wii's 3rd party support isn't even that good. Nintendo fans are mad because they could always rely on Nintendo to provide a constant stream of highly polished and worthwhile games, no matter what other deficiencies the system they live on might hold. Now they can't even do that.
Nintendo fans are mad because even though the Wii is massively successful, its failing to meet its potential, and everyone with half a brain knows that.