I don't know what you are talking about with Nintendo releasing "casual" games first. They Had Zelda at launch, along with Metroid, Super Paper Mario, Mario Strikers Charged, and Fire Emblem all released within 1 year of launch. Titles like Wii Fit and Wii Music didn't launch until later, while Wii Sports was a launch title, Wii Play came in Feb of the 1st year, and Big Brain didn't come until Fall of the 1st year which is when Metroid came out. I would say they had a good mix of every type of game in the 1st year.
Anyways, I always have and always will love Nintendo as a gaming company.