Here's a look at how 3rd party games compare in number of sales on the Wii. For this data I used the top 100 selling games in the US each for the Wii and 360 and separated into 1st party and 3rd party published games. I also took the top 50 selling games on each platform for this week. This graph shows that there haven't been as many 3rd party huge sellers on the Wii. It doesn't take the budget of the game into account, so it is difficult to tell whether or not 3rd parties have found success on the Wii.
This was somewhat inspired by this Kotaku article, http://kotaku.com/5034951/heres-that-wii-third-party-sales-proof-you-requested?cpage=3 . Since the Wii has had more games in total released for it, the total 3rd party sales are more than on the other consoles.
