Why you keep saying that's WiiU/360 tier performance when is obvious that isn't true at all!? Switch will have around 3x real world performance compared to WiiU/360, going from GPU thatwill have around double more power on paper but bigger real world performance because its latest Nvidia tech/architecture and actualy almost 10 years newer tech/architecture compared to WiiU/360, same goes for ARM A57 CPU, while it will have most likely 6x more RAM for games than Wii U had.
So I really don't understand how exalty is that "basically a Wii U/360 tier performance with some better effects and what not", when Switch will be noticeable stronger even in portable mode than WiiU/360!?
Portably no, it will be fairly close to an XB360/Wii U/PS3.
Since developers are going to have to make games for that spec, largely speaking I think what you'll get from the average Switch game is a game that is made to run first and foremost in the portable mode.
Then the docked mode will have things like higher resolution or some better effects.
You need to have a very large leap from 360/PS3/Wii U to notice a big difference, even today a lot of people say the PS4/XB1 aren't that much of a jump, or at least they were saying that until some of the more modern games came out.
The average Switch game will look like a 360/PS3/Wii U game on steroids IMO, but definitely closer to the PS3/360 than PS4/XB1. I think a bunch of games will actually just look pretty much dead on with PS3/360/Wii U titles.