Maybe the game will be divisive, just like a lot of Nintendo's recent titles.
Think about the Wii's Mario games. There are some people who think that New Super Mario Bros. Wii and Super Mario Galaxy 2 are piss easy, and there are others who think the complete opposite to the point where they can't even complete these games.
Nintendo has been trying to cater to all audiences so it wouldn't surprise me if the difficulty was based on player experience. And even if the game isn't especially hard in any way, at least there's always the options to limit how many heart containers you pick up and limit how much you upgrade your equipment.