http://imburningout.blogspot.co.uk/2013/01/nintendo-virtual-console-50-hz-matters.html?m=1
My blog explains why we should be up in arms, not why it happens.
Please have a look at the videos, it all becomes much clearer when you see it.
Back in the day TV sets came in 2 entirely different systems. NSTC refreshes at 60 frames per second but only has a certain number of pixels. In Europe we have PAL, only 50 frames per second but more pixels - so a better resolution. There's issues converting back and forth (squashed images vs motion blurriness) but only minor stuff.
That is until video games came along. Rather than reprogram games designes for 60 fps, most publishes just slowed the entire game down. Until the Sega Dreamcast no European gamer ever played a full speed american/ Japanese developed game. Only a fEw were coded properly (Donkey Kong Country, made by Rare who are British) but there's a reason Europeans can be accused of being anti Nintendo. We aren't lying when we say they've always screwed us over.
Of course PAL tvs have been capable of running 60 fps since 1995, and since HD came along the whole thing is a non issue. Still, as we were screwed first time around, and Nintendo want to be authentic, we get screwed again.
Balloon Fight on the European Wii U runs approx 20% slower than it should. The music is slow, the animations are slow, the character moves slowly...
And chances are unless Nintendo acknowledge this is an issue, all NES,SNES, N64 games on the Wii U VC will follow suit. Look at my link to see the videos, and some side by side comparisons.
Programers on twitter have agreed, the 50hz thing was a bodge because at the time technology couldn't handle it. Now however, on a brand new 'superior' console, there really is no excuse.
EDIT: oh, and if anyones wondering, the upside for a nerfed frame rate is supposed to be a higher resolution image.
Back in the SNES days games just stuck bars at top / bottom of screen, squashing the whole game. So it runs slow and looks squashed.
Yay
EDIT 2: This also affected Sega Consoles (until the dreamcast) and the PS1.
It's something that was grin and bared before, but now Nintendo is overcharging us (on the international exchange rate a EU virtual console is approx 1.8 times the cost of 1 american purchase) for inferior goods.
And their only reason why is laziness.
There was grumbling about the Wii VC being 50hz, but nothing came of it. Now we have a HD console that is no better, and proof they really don't listen to their fans.