I just purchased the Wii U. It did a system update and it took over 15 hours to do the download. I tested the internet speed on my computer and it was at 16 but it was only about 2 when I tested it on the Wii U internet browser.
I then downloaded Wii Sports Club and had the same problem, it took about 15 hours to download. I have a Western Digital N750 Router. My internet Provider is Time Warner Cable. Thanks so much for your help and time!