Great that you're looking into the Wii U Selnor. Being a recent Wii U adopter myself, I can say I was blown away by the graphical qualities that the games I have contain.
No online video does justice to Super Mario World 3D and I bet once most of the games that are yet to come out for the console are out, what you'll get on your screen will be much better than what you're seeing now.
I hope that you enjoy the console when you get it 
Current PC Build
CPU - i7 8700K 3.7 GHz (4.7 GHz turbo) 6 cores OC'd to 5.2 GHz with Watercooling (Hydro Series H110i) | MB - Gigabyte Z370 HD3P ATX | Gigabyte GTX 1080ti Gaming OC BLACK 11G (1657 MHz Boost Core / 11010 MHz Memory) | RAM - Corsair DIMM 32GB DDR4, 2400 MHz | PSU - Corsair CX650M (80+ Bronze) 650W | Audio - Asus Essence STX II 7.1 | Monitor - Samsung U28E590D 4K UHD, Freesync, 1 ms, 60 Hz, 28"
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