Thats a great bundle for 2013, the Year of Luigi.
You can get the Wii U/ NSMBU NSLU bundle at Game for £250 - http://www.game.co.uk/en/black-wii-u-mario-and-luigi-premium-pack-252398?categoryIdentifier=233218
You can get Super Mario 3D World for £43 - http://www.game.co.uk/en/Super+Mario+3D+World-206878?cm_vc=Prod_1
Essentially, youre paying the extra £7 for a Mario hat and Mario branded Wii Remote Plus. You dont get three free games at all.
It seems to me that if Nintendo encounter a problem, the first instinct is to "Throw Mario at it".