We still have to wait and see what this feature is that Nintendo wants to keep secret from their competitors that the NX will have.
They have also said the NX is another pillar alongside the Wii U / 3DS. Some people are jumping to conclusions and saying they are done with Nintendo because the NX isn't a power house and a dedicated home console?
It can be a dedicated home console if you want, that's the point of it. It can sit in its dock, connected to the TV and you can play it on a couch just like you can every other dedicated home console.
You can play Zelda NX on the TV and then take it with you on the go. Mario Maker. Splatoon.
Better performance than the Wii U without a doubt. X1 can handle Unreal Engine 4. X2 can handle it even better, if that is indeed what it ends up getting.
This is a gigantic jump in power for a Nintendo handheld, and a modest one for a Nintendo home console but enough to run all modern engines.
This won't be a mere Gamecube to Wii level in power jump.