Why are there no AAA companies trying to muscle in on Nintendo's turf? While they get slammed a lot for endlessly making the same game series they are pretty much the sole company still working on many of those genres.
Why is there no real competition to Super Mario 3D World? There's only the rotting remains of Sonic vaguely flailing in that direction, why is nobody else trying that?
Mario Kart Wii sold 35 million copies despite not even requiring HD-level budgets, what was its competition? Sonic Racing, Blur and uh... F1 Race Stars?
2D platformers? Nintendo makes like >50% of the AAA 2D platformers, while it launches a full barrage of Mario, Kirby (in two different styles), Donkey Kong and more it faces Rayman and Little Big Planet, the latter of which is sold more on its strength as a game creation tool than its platforming gameplay.
Fans are endlessly hungering for a new Zelda, a good Metroid, why was nobody there to offer them an alternative, to say "try our game, it's like those except you can actually play it now"? Yes, the hunger has caused a million indie projects to spring up but why only indies? Why does nobody with a big company try to enter a market where the biggest contenders aren't even fully voice acted and terms like performance capture aren't even considered (these are indicators of low dev costs, not low quality)?
Nintendo isn't some magical beast that does superhuman acts nobody could hope to replicate but somehow the AAA companies seem to be fighting over a tiny number of genres while this heavily wounded, anachronistic company is the sole player in a whole lot more.