Why don't we just compare the current wii to the ipad???
Ipad is a tablet device. Wii U is not. Just because you tack a screen onto a controller does not make it a tablet. They are completely different markets with entirely different functionality.
And if you wanted to play games like colonial marines on a small portable screen at home, you could just do that with OnLive on the iPad with their game controller, instead of getting a wii u.
OFFICIAL PS VITA THREAD: http://gamrconnect.vgchartz.com/thread.php?id=130023&page=1