I attended the "Wii U Experience" on Saturday in DC. It's a touring show to give fans a chance to try the Wii U in a controlled environment.
The following games were playable:
-New Super Mario Bros. U
-Game & Wario
-Just Dance 4
-Batman: Arkham City
-Wii Fit U
-Ninja Gaiden 3: Razor's Edge
There were lots of people and only two hours to try stuff, so I didn't have time to try everything. Of the above, I tried Mario, Rayman, Wario, Zombi, and Pikmin. Mario and Rayman and exactly like their predecessors except they both add "asymmetric" play by having an extra person affect the main screen gameplay by tapping things on the gamepad screen while other players use Wiimotes (Mario) or the Wii U Controller Pro (Rayman) to play the game proper. Game & Wario is another minigame collection, Pikmin is just like the first two but prettier, and Zombi U offers some interesting but ultimately distracting uses for the gamepad in combination with the TV.
The gamepad itself is very comfortable to hold, but feels too big. It's also awkward trying to switch from the right analog stick to the four face buttons since the stick is above and to the right of the face buttons instead of being below and to the left as it is on all other dual analog controllers. The Wii U Controller Pro feels great in the hands, but I only tried it with Rayman, so I don't know if the same issues I had with the dual analog setup on the gamepad are also present here.
It was a fun event with lots of energy and ample Street Passing opportunities, but there was nothing on display that made me feel like I had to own a Wii U. Granted, I'm going to buy one anyway just because I'm OCD, but if you have more self control, I see no reason why you need to buy a Wii U this year.