Again, one developer called it a stop gap. Coming out early in comparison to the other two means that being weaker is almost unavoidable. I don't see why that matters though. The Witcher, for a tired example, still plays on PC and Xbox. Since the feature set of the Wii U will be a modern one it should be able to simply scale games down from the other two consoles/PCs in a way that wasn't possible on the Wii.
Besides, the most powerful console hasn't won the generation (in terms of sales) for generations.
I agree to an extent. There's still a lot we don't know. No one is saying the Wii U will look like Avatar or be equivalent to current high end PCs though. That's what they're saying about the next Xbox.
The Avatar comment is almost certainly hyperbole of the worst kind. High end PCs is more likely, but who knows how reliable those statements will end up being, especially in relation to actual software.
I agree on this, but wouldn't that be defeating the purpose?
Well sure, but the point is that if a developer is lazy and just wants a quick buck rather than what may amount to a few lines of code, or a few extra hours of work, they can.
EDIT: Alternately, if a developer is willing to put the effort in and create a unique use or extra content for the controller, it may result in more sales for the Wii U version, which may encourage more of the same, etc.
All ports from 360/PS3. We don't know how it will compare to the next Xbox/PS3.
But that's all we have to go on, unfortunately. Maybe, toward the end of Wii U's life cycle ports will become impractical, who knows? There's no sense stressing about that in 2011 though, really.