I said after the reveal and before the launch that the Wii U's gamepad would be excellent for RTS games and PC type RPGs with a ton of skills that do not mesh well with traditional controllers. I think those are the games that should have been made to show it off.

I also think Nintendo would do well to create a Mario or Zelda point-and-click type game, kind of like Telltale is doing with Borderlands. I plan to get that on Vita for the touch-screen interface.

I suppose you're right about racing games having them, but I can still see building spiral upside-down multi-route tracks with ramps and boosts being fun and comparably easy on the gamepad. Especially if they built it from an updated HD F-Zero GFX or the Mario Kart 8.

As for 'more action games'. I can picture dropping down enemies with routes and places for cover in a style comparable to Deus Ex. It would be fairly easy to map a Unity-esque interface, obviously a dumbed down 'game-ified' system, like that to the Gamepad. It obviously wouldn't be as extensive as the real game but I can see it being good enough to become fairly popular.

Map the face buttons to rotate view at right-angles, place things on the grid using the touch-screen, set corridors to be created between where you place pairs of linked rectangles, same for walls. If you have walls that overlap merge. Then you can have a few different types of gaurds wearring different colours for different behavior, given different armour of different health, and different weapons. Few vents in the walls (which act the same as corridors), few ladders, few boxes, scatter some ammo and you'd be set.