The basic SKU has only 3GB of storage available to the user, while the deluxe only has 25GB. Meanwhile the X360 has shipped with SKUs over the years including up to 320GB of storage, while the PS3 has included up to 500GB. There isn't even an official storage expansion for the Wii U. Consoles are moving more and more towards digital distribution yet Nintendo has failed to match even the outdated storage solutions of existing consoles. It means that digital distribution isn't viable out-of-the-box for the Wii U.
Nintendo seems completely oblivious to the direction in which the gaming industry is moving.
And yet you're still implying that you can only use the onboard storage and nothing else. Some people are hopeless i guess..