I would point out as Devil's Advocate, though, that just as people claim a bias against the Wii in the media, I'd argue that that the bar has been set so low on Wii software that we've actually seen Wii grade inflation. Take the reviews for Madworld, for instance. In quite a few of them there's a tone of "well, this game has problems but we're going to give it a high score because it's on the Wii." Madworld has its moments and can be a generally-enjoyable experience (when the camera isn't pissing me off and I haven't yet gotten bored of the combat), but a 9+ ? Really? I'd argue that we've seen a similar effect with Conduit scores, where there's a lot of "well, this game isn't all that great, but because it's on the Wii and there's nothing else quite like it on the platform, we're going to give it a pass because it's a first step for Wii 3rd parties.
So I think the Wii's created a parodoxical situation in the press with the way Nintendo has handled its library: on the one hand, you have some who use the Wii's erratic library as an excuse to attack it for not being like the other consoles...and then on the other, you have some who use the Wii's erratic library as an excuse to over-hype games that don't deserve it just because they're better than the usual dreck and Wii gamers "just don't know better". I'm rather curious which faction will win in the end.