I corrected that one for you. The Wii U sold actually quite well when it launched, when eager and informed gamers bought it. Later on its sales plummeted as avarage consumer didn´t know that it was a new console and didn´t know to want it. With its games nintendo tried to get everyone on board, but as it didn´t reach public awareness it also sold badly, failed to attract big AAA third party games and many gamers lost interest in it. If it would have had a different name (almost anything would have better) and better marketing it could have been a huge hit as it would have had a lot more momentum and a lot more games would have been made for it. The downside could have been that nintendo might have been lazy and great games such as splatoon could have been less brilliant.

Wii U got much better and stronger marketing at end of 2013, but first year marketing was very weak and bad. So that basicly didnt change anything beacsue Wii U was already dead and all 3rd party deserve them.

Wii U did not appeal to parents and kids or casuals because of high price compared to the competition. Wii U is even now $100 more expensive than PS3/Xbox360 and only $50 cheaper than Xbox One.

Wii launched with $249 price, Xbox 360 with $399 and PS3 with $599. You can bet that if Wii had price of $350 it would not be nearly popular as it is. Universal casual apeling with motion controls and affordable price (especially compared to the competition), are two main reasons why Wii such a success.

Wii Sports was game one of kind because anyone could see how fun is to play even if you don't look at TV and just watching player having great time. So really there is no game that we can compare with Wii Sports and probably never will be again.

Nintendo already knows what the problem was and they stated it. The tablet was a great idea at the time of conception but by the time it released, the market has already evolved, smart phones had improved, and their tech was dated.

Yes, but on launch of Nintendo console buyers are mostly Nintendo fans so thats not so strange. In first quarter after launch Wii U sold only 160k! Only 160k in whole world in 3 months! That was disaster! Next quarter was sold 300k, so basically Wii U sold in 6 months less than half a million, and Wii U already was dead.

I agree that after launch its sales plummet as average consumer didn't know that it was a new console and didn't know if they want it.

Thats why wrote that bad launch titles are one of the biggest Wii U problems, because good launch titles can attract attention of industry not just only Nintendo fan base. Nobody wasn't aware of Nintendo Land, NSMBU or Zombi U when they were launch expect Nintendo fans, but if Wii U had Zelda like Wii had, or Mario 3D World, or Mario Karty, or Smash Bros, Splatoon or some other big and great game on launch, that would attract attention of industry and more people would be aware that Nintendo release new console with great new game and not some addon for Wii and some relevant games.

The N64 and GC didn't have a tablet getting in the way

Wii U had multiple issues but I believe software output along with the individual releases is one of the main problems. Let's take a look at Nintendo published titles during the Wii's first 18 months.

Wii Sports-November 19, 2006
Excite Truck-November 19, 2006
The Legend of Zelda: Twilight Princess-November 19, 2006
WarioWare: Smooth Moves-January 15, 2007
Wii Play-February 12, 2007
Super Paper Mario-April 9, 2007
Mario Party 8-May 29, 2007
Big Brain Academy: Wii Degree-June 11, 2007
Pokémon Battle Revolution-June 25, 2007
Mario Strikers Charged-July 30, 2007
Metroid Prime 3: Corruption-August 27, 2007
Donkey Kong Barrel Blast-October 8, 2007
Battalion Wars 2-October 29, 2007
Fire Emblem: Radiant Dawn-November 11, 2007
Super Mario Galaxy-November 12, 2007
Link's Crossbow Training-November 19, 2007
Endless Ocean-January 21, 2008
Super Smash Bros. Brawl-March 9, 2008
Mario Kart Wii-April 27, 2008
Wii Fit-May 21, 2008

U can see that there was never a drought between releases and their was a large amount of variety. U had things like Zelda, Metroid, Fire Emblem for the really hardcore Nintendo fans, the Wii series, Brain Academy, WarioWare for the more casual gamer, the big casual/core Nintendo titles like Mario platformer, Smash Bros and Mario Kart and some other titles that fall between those categories. Variety+consistency, something Wii U never had.

I hope they really do know. So they won't make the same mistakes again. 

Zelda: Twilight Princess, Super Paper Mario, and Fire Emblem were repurposed GameCube games, if you remove those the first year lineup isn't nearly as impressive. 

Still the system really didn't need any of those games ... Wii Sports is what made the console unique and special and that drove hardware adoption for the first 12 months at least. 

Nintendo wanted to clone the Wii with the Wii U, but this didn't happen.

Those being repurposed titles doesn't really matter, does it? I fail to see how that's relevant.

Of course Wii Sports along with motion controls was the major selling point for Wii in the early days but to say Wii didn't need other games? That's retarded. Wii Sports couldn't do that alone, it needed other games to maintain and increase hype. Consistency+variety in release schedule HELPED make Wii a worthwhile purchase for many different demographics.