The games mostly and the GamePad, I can't really praise anything else.
As for the games these would be Wii U's most memorable, the popular ones pretty much:
Bayonetta 2
Donkey Kong: Tropical Freeze
Game and Wario
Lego City Undercover
Mario & Sonic at the Winter Olympic Games: Sochi 2014
Mario Kart 8
Monster Hunter 3 Ultimate
New Super Luigi U
New Super Mario Bros. U
Nintendo Land
Pikmin 3
Rayman Legends
Shin Megami X Fire Emblem
Sonic: Boom
Sonic: Lost World
Super Mario 3D World
Super Smash Bros. 4 (Final Title Yet to be Revealed)
The Legend of Zelda: Hyrule Warriors (Final Title Yet to be Revealed)
The Legend of Zelda: Wind Waker HD
The Wonderful 101
Xenoblade 2 (Final Title Yet to be Revealed)
Zombi U
This list is generally good but not great because if Nintendo wanted they could have brought other franchises than just Mario, Zelda, Pikmin, Smash and Donkey Kong (DK:TP is a fun game but nothing new, imo).
As for the games these would be Wii U's most memorable, the popular ones pretty much:
Bayonetta 2
Donkey Kong: Tropical Freeze
Game and Wario
Lego City Undercover
Mario & Sonic at the Winter Olympic Games: Sochi 2014
Mario Kart 8
Monster Hunter 3 Ultimate
New Super Luigi U
New Super Mario Bros. U
Nintendo Land
Pikmin 3
Rayman Legends
Shin Megami X Fire Emblem
Sonic: Boom
Sonic: Lost World
Super Mario 3D World
Super Smash Bros. 4 (Final Title Yet to be Revealed)
The Legend of Zelda: Hyrule Warriors (Final Title Yet to be Revealed)
The Legend of Zelda: Wind Waker HD
The Wonderful 101
Xenoblade 2 (Final Title Yet to be Revealed)
Zombi U
This list is generally good but not great because if Nintendo wanted they could have brought other franchises than just Mario, Zelda, Pikmin, Smash and Donkey Kong (DK:TP is a fun game but nothing new, imo).