If you've been wondering what exactly the point of the GamePad is, this little quote from the Financial Results Briefing gives some insight on how Nintendo views its Wii U GamePad:
Mr. Iwata also commented that of the games that are scheduled for release in 2015, many "fully utilize" the Wii U GamePad.
This idea of parents and children playing together on the Game Pad is a new tack for Nintendo. Previously the Game Pad was not positioned as a family device, but by turns as a TV remote, a remote play device (at which it works extremely well, by the way), as a second screen for game UI, or as a motion controlled scanning device.
All of these use are completely valid, and I'm not taking away from the functionality of the Game Pad, I think it's great. It's just that using it in a way that involves "parents and children having fun together" needs to be more fully explored, and I don't think Nintendo has really done that yet.