could be a good protential domain name providing its seo and advertised right.
but i think u could find yourself in a law suit possibly from nintendo. you might need to check that out first!!
No worries for that, alot of domains not owned by Nintendo have "Nintendo" in it. They actually support a few of them. GoNintendo.com actually got support from Nintendo itself to develop the site.
Most of these video companies welcome these unauthorized websites as free advertising. When the Playstation 3 was released Ebay was saturated with domain name offers for the system.
Nintendo.eu.com is good, but it will definitely need to be marketed to help people remember the .eu.