Not to mention that the PS3 version of the Godfather flopped BIG TIME. The Wii version at least sold.
As for sales, I already made a thread about this. There are a lot of best selling titles on the Wii, some are downright surprising. For example, despite having serious issues that put the value of the company into question Guitar Hero 3 on the Wii sold incredibly well. Hell, if you look at the recent sales data the Wii version is on the top 20 while the PS3 and 360 versions have been going down.
The Wii version of Lego Star Wars: The complete Saga is still selling, especially since its basically the two games combined into one and lacks online play.
The Wii version of Sega Superstar Tennis is the ONLY version that hit the top 50 charts. No word on the 360, PS3 and even DS version.
This is a case of people conveniently looking at something and running away with it. While its sad that these titles didn't sell well you have to remember a handful of them are ports of nearly 2 year old games. If they are unchanged from the original version then expect people to not care and move on. Finally, in the case of multiplatform games the emphasis is placed upon the XBOX 360 version by both the developer and the media(when Gametrailers reviewed Bully: Scholarship edition they only showed footage from the 360 version with only a few shots of the Wii version). So its expected that the Wii version doesn't do as well as the 360 version, but sometimes its surprising how well it stands up.
As for Rayman, you have to remember that the first Rabbids game was a HUGE success that gained a loyal following, so seeing the sequel sell so well ain't that surprising.
Once again, this is people making a mountain out of molehills. Some games could've and should have done better, but the outlook is not grim at all and third parties are not in danger.