Nintndo gives proof of third party Wii sales.

[Loud_Hot_White_Box]

LordTheNightKnight said:

Of course since this is on Kotaku, the fanboys changed the line from just straight "Third party games don't sell on the Wii," to "What is the attach ratio?"

 

While Kotaku are a bunch of huge huge 360 fanboys, I still think attach ratio is important if you are trying to show whether 3rd party games sell well on a platform.  Of course, attach rate isn't the only metric of success (evidenced by your PS2/GC example.)