I don't entirely understand your complaint. Think about it this way, it'll be more powerful than say a PS3 or 360 but be less powerful than a PS4 and Xbox One but it will give you the option to take it with you wherever you want to go. The plus side is that you CAN use it as a home console and never take it mobile if you want to. You have a choice.
But it really isn't 'portable'. it is huge, cumbersome. They basically double-downed on the clunky tablet/controller thing from the wii u. It isn't small enough to be really that portable (can it fit in your pocket? no, so people will have to lug this around in some protective case, or backpack, which ads to more bulk) and b/c they tried to make it portable, they had to sacrifice a ton of performance. I will wait and see the reviews, but I really can't see it doing 1080p with decent framerate. They're also going to cannibalize the 3ds sales by pushing the portability angle. throw in the lack of backward compatibility, nintendo is REALLY banking on their rabid fanbase to gobble up all the mario/zelda/starfox/cart/metroid rehashes