I know some people that works with EA, and the company gave up on Nintendo like 2 years ago. They had some good assets for some of their sports games (Madden, Fifa, etc) because they produced those games for the previous generation so those same games this generation are usually good and they spend very little making the game better every year, but they didn't had a good expertise developing other genres on the gamecube.
When this gen was starting they bet the house on the PS3 (and in the Xbox360 in some way), they place their best teams to work on games for those consoles, when they saw that the Wii was the clear winner, it was too late for them.
Instead of putting some of the good teams to work on the Wii they always hire some small company to handle the Wii version of the games (like it happened with this year Need for Speed), when they hire good companies (like Eurocom for Dead Space the same people in charge of the great Goldeneye) they make design mistakes like changing the genre of the game, create a horrible boxart, not advertise the game, or charge 50 dollars in a genre that people perceives as low on value.
They started this generation trying to diversify their portfolio but they did it for the HD consoles, now they have some good games to sell, but they don't have the assets to publish those games for the Wii, and are not willing to spend the money required to create them.
