So... i tried Xenoblade for the first time on my WiiU, actually as the first Wii game ever on my WiiU (i had completed the game on my regular Wii obviously). A couple of things:
I did feel the game looked better on my WiiU (HDMI) than it did on my Wii (Component? The one with the 5 cables). Either that, or my memory has done the game a disservice by exaggerating how bad it looked on Wii.
It did look "smoother" on the gamepad, but it lacked a bit of sharpness, so overall i still would prefer it on the big tv over the gamepad.
I feel people are overreacting when it comes to playing Wii games on the gamepad. Obviously, for motion based games and especially pointer games, it would be clumsy to use the gamepad as a small tv for you to wave your wiimote in front. And yet, is there an alternative? Can we really expect them to map motions and pointer controls to buttons? Each game would need its own patch, this would simply not be doable.
So what's the fuss all about? Not being able to play games which don't have motion or pointer controls and can be played with either the classic/pro or gamecube controller? Well, when i tried Xenoblade, i had no difficulty whatsover, just putting the gamepad on my lap, and playing with the mote+nunchuck combo, with my hands next to my legs on the couch. I seriously feel this is being blown out of proportion. Of course you still need a second controller, but as soon as you put your lazy as down after grabbing that controller, it really didn't bother me. But ofcourse, that's just my opinion.