I keep hearing this "Nintendo has turned it back on me/hardcore gamers" and it kinda bothers me because they HAVE NOT. Its one of 2 things or maybe a combination that may make you feel this way.
1. You have grown up or moved on(intrest wise). Nintendo will forever focus on the largest two pools of gamers(kids and casuals) because it makes them money and the games have pretty much always been more kid friendlie than any other company. This may not be your thing anymore. Maybe you ahve grown up from mario/samus/pikachu and require a CoD or Diablo or maybe a little Grand Turismo.
2. What used to be a hardcore game is NOT a hardcore game now. Do you remember the first 3 CoD games? Yea no one on earth does either. That was in a time where FPS games were not the "THING" and no one would consider that a MUST HAVE CORE GAME. But now look, FPS/CoD is what every game is compared too(whether it be style/gameplay/sales....ect) and looked forward too. The days of mario/sonic....ect being the "THING" or a MUST HAVE CORE GAME are over. Things have changed.