Honestly I think it's just Nintendo fans who are salty about these games (big Japanese games like KH,MH etc.) not being on their platform of choice. Because I can't explain the pessimism around these games that clearly have signs of success (a lot of hype etc.).
I don't blame them. They've been exposed to the series (far more than the Xbox fanbase). Not saying anyone is entitled, but I'd understand that frustration.