Actually, guys, he doesn't even say that Mario games are bad. In fact, he implicitly admits many of them are very good: "We wouldn't ask Disney to euthanize Mickey Mouse, and Mario doesn't need to disappear either."
His problem is entirely with the fact that there are so many Mario games. He just wants new Nintendo characters. My guess is that he'd be completely fine with Super Mario Kart and Super Smash Brothers if they happened to feature other characters. It isn't that Mario games are bad, it's just that he's personally tired of seeing Mario, whether his games are good or not.
I'm not saying that's a fair argument, I'm just saying that's what he's saying.
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