>since you can buy them for dirt cheap nowadays and it has a gigantic library of games
It has a dwindling one. I imagine the few games left exclusive to it won't be left that way for long (TW101 and 3DWorld).
>Wii, Gamecube, Wii U VC
The caveat is that video output for these systems on wii u is seriously diminished and extremely dark for some reason. It looks really ugly, making it a system that's far from ideal for these consoles. It's a lot of sacrifices for a "convenience" that ends up looking worse than even composite on their respective consoles.
>Wonderful 101 for the thousandth time
That's the WiiU. Easily Nintendo's worse console to date.
Seriously, just get a Wii. The WiiU failed and not even the homebew scene cares about it.