Considering how long this game has been "in the making" I can understand. Either way, wait for more than pikmin, like another mario 3d adventure THEN get a wii u. Nintendo is notoriously slow bring out their games so I wouldn't jump right in, esp with the threat of different colored systems, cheaper launch games...
I did that with the 3ds and am very happy I waited.
"I know how the business works because I'm a wrestling fan"-hulkhogan1
I have never been overwhelmed by the games available on any console's release. I'd bet Mario is the first real killer app on the Wii U. I think Pikmin 3 will do OK because it's slated to come out when the library will likely be a barren wasteland of no games.