Nintendo means bad news for 3rd parties!

[Bodhesatva]

The obvious problem with your logic, Shane, is that the best titles currently available for the Wii are all made by Nintendo (metacritic gives Zelda, Super Paper Mario and Wario Ware the best ratings of any games on the system, and Wii Sports obviously comes with the console), while the best games made for the PS3 are not made by Sony (the highest rated titles are MotorStorm and Resistance). Not surprisingly, this creates a disparity. 

 

Historically, 3rd party games with critical acclaim have sold well on Nintendo consoles, plain and simple. This even includes the Gamecube: the three highest rated 3rd party titles, Rogue Squadron, Rogue Squadron II, and Resident Evil 4 all sold quite well.  

So the problem isn't that Nintendo system owners only buy games made by Nintendo -- the problem is that they tend to buy games that are better. Right now, that happens to heavily favor the games made by Nintendo. Since the games actually developed by Sony recieved mediocre reviews at best, this tends to currently favor third parties for their system.