The gamepad was not used for games that would be good with a touchscreen.
Professor Layton (solving graphic puzzles)
Animal Crossing (making patterns, changing the village topography)
Trauma Center (playing doctor)
The gamepad was not used enough for gyro controlled games.
Pilotwings (controlling planes, parachutes, wingsuits, jetman-wings)
Wave Race (controlling jet-ski)
Monkey Ball (tilting)
The gamepad could be used for the UI in games like:
Endless Ocean (virtual aquarium)
RPG- and FPS-games (all inventories on the gamepad)
More games that could use the gamepad like Nintendo Land: Mario Chase, RTS, Sims, Minecraft.