Yeah, I disagree with brood on that matter, too. All of my previous generation Nintendo consoles are proof that I buy more third party games than 1st party - yes, even the Nintendo 64. And in the few, short months the Wii U has been available, this is still true for me.
Sure, third party games in the previous two gens sold fewer copies of their games on Nintendo consoles when compared to the other guys - with Soul Caliber II, Resident Evil 4, and a few others being exceptions, but they still sold well to each Nintendo console's respective audience.
The problem lies in how the western side of the industry is really trying to push Nintendo aside. I fully believe the main AAA producing third parties, along with graphics engine creators, are wanting this to be a two console race. I mean, look back to the days of pre-GameCube/PS2/Xbox. There were always just two main consoles (poor Sega.) NES/Master System, SNES/Genesis, N64/PSX. It wasn't until Nintendo flubbed up going with carts for the N64, that third parties decided to shift their focus on new sights. The GameCube was Nintendo trying to do things right - to make things more appealing for third parties. They just happened to not see how important online play or having an online interface/infrastructure was. And honestly, the Wii was just that, too - a new way to interact with games...that Nintendo thought would entice third parties to create new experiences (to keep from having Uncharted, Uncharted 2, Uncharted 3, God of War/2/3/4 etc etc.. basically, the same tired game mechanics over and over and over with updated/shinier graphics - brood will eat this line up for dinner. And as I look at my Wii game collection, it's true in a way - not for western third parties, but Japanese third parties really did bring some innovative new gameplay experiences to light. And I'm grateful for that.
It's also why I believe the industry is fighting with itself and the imminent east vs. west split. Oh, but here come the indies! In a way, the indies remind me a TON of when small scale studios made awesome games during the NES days. Sure, not all of them were great, but there were the occasional gems that truly stood out. And if Nintendo is welcoming that with open arms to the Wii U/3DS, then so will I.
But brood, to say that you only buy a Nintendo console for Nintendo games and nothing else...that's a boldface lie.