That's bull. Sure, there are "sequels", but Nintendo put their amazing and creative ideas into said sequels. Just because it uses an established character does not mean it's not creative.
Also, with the other consoles, please tell me the "step up" Sony and Microsoft have done with their software, because I honestly don't see it..
I also argue that Nintendo's games are a step up from previous generations. People just focus too much on New Super Mario Bros. U and use it as the poster-boy, even when it's not necessarily valid. Yes, the Gamecube did have a lot new to it, but that's because the generational leap between the consoles was so large, especially compared to the last two.