I noticed it recently since my daughter has been asking me to play various Mario platformers with her on Wii U and 3DS. I can jump into any level and typically beat it on the first try, often without being hit at all. Even if it's right at the end of a game.
This makes me wonder, have I gotten too good at Mario games? I still enjoy them, but they don't give me the same challenge they used to.
If a new Mario platformer comes out I always pick it up. Lately, I'll beat the game within the first week. Sometimes it's even within the first couple days.
I probably sound like an ass since I'm saying I'm too good at something. But, when skill level and challenge level don't match up it can be frustrating. It can go the opposite way too where the challenge is just so far above a player's skill level that it's frustrating.
I would really like to see a Mario game for expert players of the series. People like me who have grown up with Mario and truly want a challenge. I think it would be really fun. I also think it will never happen. Nintendo wants to stay accessible to kids, and I'm fine with that. Chances are I'll never get my challenging Mario platformer, but at least my kids with get to grow up with Mario too.