MGS ground zero demo is outstanding, imho.
I think that it will not come to the Wii U, but this doesn't change the fact that it is so great, graphically, considering that it's running on a PC with similar PS3 specs, listening (and I trust them) KojiPro. It's another multiplatform title with PS360 that will not come to the Wii U, unfortunately.
I agree with users that said that it's not so easy for a brand new console to get all the multiplatform titles planned and developed for other systems that are able to guarantee a large install base and an active user base up to now, especially if dev kits were provided late in the development cycle for games aimed for end 2012 and early 2013. But I also think that being a Nintendo home console didn't help in getting the devs on board. And this is a pity, for the Wii U. I also agree that we are seeing few and weak but concrete step forward compared to the Wii, for 2012-13 at least. Than, with the introduction of new HD console probably a lot more powerful than the Wii U, we could see the Wii's struggle again.
I have also to admit that, due to the fact that I'll but a PS4 for sure (due to firts party games as God of War for example) if the Wii U will be able to get that support the Wii had for a couple of years, with small but interesting exclusive titles, I'd prefer this situation to the Wii U's multiplatform development. So I can buy Nintendo first party + minor but cool exclusives for the Wii U and Sony first party + AAA third party mlutiplatform titles on PS4.
About MGS Ground zero, the cool thing Wii U related is that the game shows incredible graphics that, up to now, we should believe to be possible on PS3. That measn that Wii U could offer this kind of graphics or even slightly better.
Obviously when (if?) the right teams with the right budgets will develop for it. And for this reason I really hope that Nintendo will surprise us, compared to the E3 show of last June, with projects dedicated to this kind of entertainment: I think that they have at least three first party teams (Retro, Monolith and EAD 2 (Zelda?) and a couple of second party teams that can work both on traditional IP (Zelda, Metroid and Star fox) or propose new IP (as they did with Xenoblade and Disaster) that can satisfy that target.