The Wii U has an overscan issue with many televisions. resulting in an image where parts of it are cropped. This can hamper your gameplay experience as important UI elements can become obscured. Oddly enough, Nintendo has implemented a screen size setting option in Miiverse and the Nintendo eShop but not for the whole system. This is a simple fix that would benefit many Wii U owners and improve their gaming experience.

Examples of how pervasive the issue is:
http://www.ign.com/blogs/andreweisen/2013/01/16/wii-u-dont-need-no-tv
http://www.destructoid.com/the-weekend-hotness-overscan-on-the-wii-u-sucks-238917.phtml
http://www.neogaf.com/forum/showthread.php?t=500489
http://www.gonintendo.com/boards/viewtopic.php?t=99202&p=733307
http://www.avsforum.com/t/1440533/a-device-that-adjusts-overscan-does-it-exist-wii-u-owners-also-read-this