I would play it, i actually have my original Wii edition still sealed. And i have to play it still. But the Wii U does display the Wii games much better then the Wii. Mainly because modern TV's use cheap analogue convertors as manufactures seem to assume everything we are using is a HDMI source. OK my TV is much smaller then your 50inch , only 28inch. But i find the Wii games look a lot better on Wii U through HDMI. but obviously they are only probably displaying at 480p at best.
I sometimes use a Projector with my Wii U , giving me a display of 80inches diagonal. ,but i have to change the settings to 480p to display Wii mode games , and back to 1080p for Wii U content because in 1080p through component the Wii games look stripey.
So it must be even in Wii Mode the Wii U only outputs 480p max. but i still think they look better then using a Wii hooked up to a TV. The Wii really needs a analogue CRT TV .
I have been playing Conduit, Tournament of Legends,Cursed Mountain in Wii mode on ii U lately and think they look fine. I take it your Wii U is hooked up via HDMI and not component. As i find my Analogue lead consoles like Dreamcast,Wii ,Saturn look a little washed out on my newer LED TV's . But on my slightly older larger LCD they look crisp. Mainly because in the early days of LCD they still used quality analogue convertors in the TV's .but now they use cheap converters to save money, like my LG.
Now if your using HDMI on your Wii U, you could try a component cable for playing Wii games ,just hook up the analogue lead to Wii U using the component socket on your TV. Switch the source from HDMI to Component on the gamepad and be sure to set it to 480p s this is Wii games max output.. You just switch between the two inputs to play Wii U or Wii games.
It's what i do between my projector and TV ,both leads are connected to the Wii U and i just switch on the gamepad to where i want the signal to go.
Hope this is some help.