It will take a year or two after the WiiU launches before we can accurately form any opinion on it. Going by how it appears at its launch or even a few months after its launch isn't enough information to go by. We need to see how it stacks up once the competition appears, and we also need to see how the long term software support is going to be. When the Wii launched it looked like it was going to have promising support from both Nintendo and 3rd parties alike, and I don't think any of us dreamed that this many years into the Wii's life it was going to be dead in the water with zero support from anyone. Back in 2006-2007 the Wii was so insanely popular and selling so well that it was unthinkable that 3rd parties and Nintendo would both abandon it, but that's exactly what happened.
So like I said, its going to take a few years before we'll get a full and accurate picture of how the WiiU's software is going to be. Its looking promising right now, and if things look great at launch then that will be a good sign, but it won't tell you how things are going to be over the long term. That's the real issue. I think a lot of it depends on how powerful the next Xbox is going to be. Apparently the PS4 is going to be about the same as the WiiU, so there's no problem there, but what if the next Xbox smokes both of them? Combine a super powered Xbox with the fact that it is going to hog up all the PC ports and it could end up getting the lion's share of software support.