Bit of a misleading title, let me explain:
Wii games look like crap on any HDTV. Period. If you want the best quality for a Wii game, get a 480p enabled SDTV and component cables.
I recently bought a Panasonic Viera Smart TV, 42 inches, 1080p, bla bla.
Wii U looks great, I even calibrated the TV using Disney WOW calibration blu ray.
Wii, looks like crap. Of course.
If you select the INTERNET option on the Smart TV, the whole display will shrink, and then the smart options will appear next to it (Youtube, netflix, etc.)
Turns out that since the image of the Wii - Wii U output has been shrunk...it looks PERFECT! No jaggies, and it keeps the visual clarity and sharpness you would expect!
Of course, you have to deal with all the other boxes of Smart TV items next to it, and my TV for example, has a "timeout" pause thingie that disables it after a while...but....
If some of you can mess around with the TV and if you prefer the visual fidelity of the smaller screen, then go for it! Wii graphics have never looked better!
1- Skyward Sword