Visually, Resident Evil: Revelations looks fine on the Wii U. It isn't up there with Resident Evil 5 (though I'm sure Nintendo's new console is more than capable of handling it), but it takes the work established in the original 3DS version and ably expands it to fit a better aspect ratio. The game also looks great on the Wii U GamePad; while I don't at all see this as a substitute for a HDTV with an HDMI input, it's viable for those who allow themselves to be kicked off the television. If you're not one of those people, the GamePad condenses your map and inventory into a single touchscreen interface. I don't like having to glance down while I'm playing, so I'm not a huge fan of this feature. But hey, it looks nice, which is good for something, I suppose.
Sound-wise, Resident Evil: Revelations for Wii U is an obvious improvement over the 3DS original. One of these days, Nintendo will be able to outfit their handheld devices with some acceptable speakers, but as of this writing, the day seems kind of far off. This game doesn't waste too much of its time communicating through the GamePad, so you're free to listen to all the horrible dialogue and explosive gunplay through your own hardware.