I got bad news guys.
Nintendo's Wii-U emulation is pretty bad. I've just tested their new release of Balloon Fight, and here is the list of problems.
1. Poor Gamma - (not as bright as the original NES, but then again, the Wii's NES emulator had this issue too)
2. Poor Colors - (same as the NES emulator on Wii, just a dull color palette, poor compared to the original NES)
3. No filtering Options - (no scanlines available, just a standard (non-lanczos) interpolation bilinear filter)
4. No Double Strike-240p mode - (for those who wish to hook up to a CRT for a more true experience)
5. Sound Not Correct (Although I could be wrong here, but it does not seem to have accurate sound)
5. Horizontal Stretch AND Vertical Squeeze - (Quite possibly the biggest offender. Simply put, the aspect ratio is WRONG. The original console - when hooked up to a CRT - would send a signal to display the 256x240p in a slightly wider aspect ratio, not quite 320x240, and not quite 256x240, somewhere in between. In other words, it was slightly narrower than 4:3, and slightly wider than 16:15 once it arrived to the CRT from the console's output. Well, the original's Wii emulator did this correctly, regardless whether it was in 240p mode or 480p. It would show the aspect ratio correctly, just like the old CRT. But for some odd reason, Nintendo is stretching the image even wider, AND to add insult to injury, they are SQUEEZING it vertically too. In other words, its close to a 8:5 ratio or thereabouts! Doesn't matter if you hook it up via HDMI, or Component, or even to your old CRT via composite, nor does it matter which resolution you choose, be it 480i, 480p, 720p, 1080i, or 1080p. Its just the WRONG aspect ratio. I've tested this on both a SD-CRT and HDTV for your convenience.)
I use to think that Nintendo cared about preserving nostalgia EVEN IF only a little - I mean afterall, their SNES emulators on the Wii are virtually perfect, even if the NES one's are not (only real issues were gamma, color, and that annoying "tinny sound" that the original NES did not have).
Will they release an update to correct these issues? We can hope and wish, but don't hold your breath.