I've always been intrigued by the Wii and the few times I've played with on they've been a blast. I still don't know that I would see myself owning one (at least without a PS4 or Xbox as well), but who knows. I'll have to read up on the the Wii U a little and maybe take a swing by best buy to demo one.
Early on, I didn't really care for the Wii... thought it was just a gimmick. My sister bought it for me though, thinking that "as a gamer I must have wanted a Wii" and my only real thought was "Already borrowed this system+only game I wanted from someone and it wasn't even that good". It didn't help that the Wii maxed out at 480P while my PS3 was doing gorgeous 720P.
But then Wii games just kept trickling in for it that I just could not help but LOVE! Okami, Fragile Dreams, The Last Story, Zelda: Skyward Sword, Pandora's Tower, Super Mario Galaxy, Super Mario Galaxy 2, and finally, a game that had imagination and scope that you can't fathom, Xenoblade Chronicles. By the end of its lifetime, the system just had a quality library of exclusives. The party games - Mario Kart, Wii Play, Wii Sports Resort were always a fun time when people were over, too. I still love my PS3, but probably liked Skyward Sword and Xenoblade Blade Chronicles at least as much as I liked my favorite PS3 game. It always made me sad that Wii wasn't HD.. it's like loving that one song but only having a 128kbps MP3 of it.
The Wii U hasn't been selling very well, since the new "gimmick" is the tablet, when most people already have an IPad or the like. But it has some well-received exclusives... a lot of people feel that ZombiU is a "true" survival horror game - a genre that has basically been turned into "Zombie Action Shooters", Rayman Legends is a very well-received platformer that won't sell, Wonderful 101 is a unique over-the-top action game that won't sell, and Pikmin 3 is a quirky strategy game that won't sell either.
Even I wasn't really sold on Wii U until I saw the trailer for X, the spiritual sequel to Xenoblade and Xenogears:
Wii U - New title developed by MONOLITH SOFTWARE INC. Trailer - YouTube
But that seemed so far away. Then I saw the trailer for the new Mario... the level design seems amazing and the multiplayer looks perfect for having friends over
Wii U - Super Mario 3D World Gameplay Trailer - YouTube
and the flurry of reviews giving it 9/10 or perfect score just went and sealed the deal.
The only big negative about Wii U is that it unlike Wii, it doesn't have a controller port for playing Gamecube games, even though it should be backwards compatible. Eventually I'm sure we'll get those games on Virtual Console or HD remake to be played with a WiiU controller though just like the Wind Waker HD. Because Baten Kaitos, Tales of Symphonia, Thousand Year Door, Baten Kaitos Origins, Skies of Arcadia Legends, Eternal Darkness, MGS Twin Snakes, and Viewtiful Joe are not games that should be lost into the past. The system is however backwards compatible for Wii, so if you ever wanted to play the list above, you'll have no issues as long as you grab a WiiMote (might need a nunchuk and might want a Pro Controller depending on the game), and you can play the Wii games on the little tablet screen or your TV.