Buddy, that is probably the best emulation system. You could run gamecube, n64 , turbo grafx 16, snes, nes , game boy advance, nintendo ds, orignal wii games, ps1 games and even more on retro arch
Yeah, the Wii U is kind of like Nintendo's fat PS3 model: unwieldy as hell, but can emulate just about any system Nintendo other than the 3DS! You could even play arcade and PS1 games, if one wanted! IDK if DC ever found its way to the system, or if it'd even be possible or practical to attempt on the peculiar setup Nintendo decided to go with for the system!
you can even put the 3ds on the wii u, sorta, with ntr viewer I believe. I've never used it except for an ntr view thing on my laptop with kit kat slim. I don't know how well it works, but the wii u is like the vita: failure, but damn good at emulation.
Man we were gonna have a game night at my buddy's house but he wasn't feeling great so he canceled, which throws my dinner plans up into the air, so I guess it's time to order a pizza or something