2 bad to average games in 3 months, around the same timespan when they released Yoshi's Woolly World, Fast Racing Neo, and Xenoblade Chronicles, 3 great to REALLY great games.
Not including the other great games they've got coming this year for Wii U. AND not including the 3DS side of things.
There is not a video game company in existence that hasn't released a bad game. Every company stumbles sometimes, and Nintendo is stumbling a bit right now. But fallen? Hardly.
If they fuck up one of their BIG titles like Zelda, Pokemon, or Smash Bros. Or if they put a Konami on some of their greatest developers and staff like Miyamoto or Sakurai THEN we can say they've fallen. This is not falling