Because wii u is a home console and 3ds a handheld,all Nintendo handheld sold very well but expect wii and maybe Nintendo 64 all other Nintendo home consoles sold poorly.

The first mistake is comparing the Wii U's situation to the 3DS and Vita's. In terms of markets they serve, the baseline, competition they can not be further from the same.

My main reasons for the Wii U underperforming and not having a 3DS like return is because again as I mentioned in my previous thread its low baseline will be almost impossible to get out of. Even if sales triple from current levels, you are still looking at a system selling less than the PS360 currently. Also I am drawing parallels to the gamecube of 2003 (April to June 80k total shipments worldwide) but with less support.

Gamecube shipments fiscal year 2003 (March 2003 - April 2004) total 5.02 million
Price $149 dollars until September 2003...$99

Games:

Nintendo First Party:
Zelda Wind Waker
I think 3 zelda collections
Mario Kart Double Dash
Kirby Air Ride
Mario Gold Toadstool Tour
Mario Party 5
F-Zero GX

Exclusives (if only timed):

Ikaruga, viewtiful joe, Star Wars Rogue Squadron III, P.N 03

3rd Party:

All EA releases:
Nba live, Fifa, NCAA, madden, need for speed underground, plus games from EA BIG such as the street games, SSX3, def jam venetta and the sims

Ubisoft support:
Rayman 3 Hoodlum Havor, Tom Clancy's splinter cell and Ghost Recon, beyond good and evil, Prince of Persia sands of time

3 Resident Evil remakes/re-releases, Soul Calibur 2, Final Fantasy Crystal Chronicles, Simpsons Hit and Run, Tony Hawk Underground

All the above all in 2003 (i'm probably missing some games) with the price cut (which was already low to begin with) and only managed 5 million. Nintendo expects 9 million this year with a console triple the price, less support, pretty much the same games (Wind Waker? Resident evil remakes, A Nintendo party game, pretty much parallel Ubisoft support, and rumblings of a Mario kart not making the holiday season release date.) lead me to believe that this console is not set to sell.

One important thing that a great deal of people forget is that the Wii U had a very successful launch. It did over 80% of the Wii's launch sales.

The problem with the Wii U since this year started has been lack of software. If Nintendo had managed to get the likes of Wii Fit U, Pikmin 3, The Wonderful 101 and Game & Wario released between 1st January and 31st March, as was expected because they were all supposed to be launch titles, and Rayman Legends had launched in February the Wii U wouldn't have lost this much momentum.

Now that Nintendo appear to have got their act together we're going to see the following released between now and the end of the year: Wii Fit U Pikmin 3 The Wonderful 101 Game & Wario Wind Waker HD 3D Mario Mario Kart 8 And then going into 2014 Nintendo should have a steady stream of ducks in a row with the following: Yarn Yoshi SMT x Fire Emblem Wii Sports U Retro's new game X All before E3. And then you've got a potential price cut likely to coincide with the launch of 3D Mario in October. I think Microsoft have considerably more problems with the One than Nintendo do with the Wii U, and Sony with the PS4. Both consoles are going to be over $400 imo, maybe as much as $499.99.

It have a better launch then wii but now it is a way behind it  and i`m looking to preorder of Wii Fit it's not looking is doing very well i don`t think it will help very much wii U,i think wii u it won't doing well because it look like gamecube Mario didn`t help it.But who know maybe i`m wrong but people had enougth reason to think wii u will not doing well.

For Xbox One i don`t know how it will do but ps4 i think it will doing well because Playstation is really popular many fans will buy it even for 400$ and like you said even ps4 and xbox one will had price cut and maybe it will sold very very well.

Third party are who make playstation and xbox succesfull i can`t see wii u having a better third party support.

I think you misunderstand what I mean by that. Not so much sales but public perception. The average person on the street would not have been able to tell you what a Dreamcast was (in the UK at least). The same goes for Wii U. I havent met a single person who owns the system and when people have seen the pad in my living room they have no idea what it is. I did own a DC at the time of Sega's exit from the hardware market and it feels similar. Few large shops stock the games (i.e supermarkets), nobody is actually that interested and everyone is talking about the other systems being released in the near future.

Dont get me wrong I loved DC and now I love Wii U. In fact Im much happier with Wii U (at launch) as a gamer than I ever was with Wii, but I do think Nintendo need to act even if it means taking a hit.

Already been through this a bunch of times, Nintendo lost money on the Gamecube. The only reason they were profitable was because of their booming handheld consoles, while Gamecube was sucking them down. Nintendo also had hugely disappointing sales and lost tremendous amounts of marketshare on both the N64 and the Gamecube. These by definition were flops. That period was the dark ages for Nintendo.

The original Xbox was a flop too, I never argued it wasn't.

No no, the holiday season starts around october, you silly, it's not just christmas, but also thanksgiving, and black friday and lots of other holidays worldwide. It's basically Q4. And WiiU didn't release until the end of November (December for Japan), so judging it now is preposterous!

Silly me, I forgot about the other two holidays... Hersennen is anders geplaats, holle hoofd. XP

The Wii U is selling less worldwide each week than the Vita in some instances. The 3DS was never on life support like this.

Granted when Mario Kart and Smash Bros come out it will do ok.

People who own a Vita love it too, as did people who owned a Dreamcast or Gamecube back it their days.   That's not the problem.  The problem is the optics. Core gamers look at the WiiU and think, 'I don't want to use such a bulky controller, and the system is too expensive for PS3 type graphicss'. The Wii audience look at it and think, I don't want to use a bulky dual analog controller, I want to play Just Dance and Wii Sports with motion controls.    

Yes, if they tried it, and got used to it, they might really enjoy it, but no one wants to try it (for more than a few minutes and a few minutes doesn't sell it - in fact it probably hurts perception) then it's a bad design choice.   It could be the best thing in the world, but if no one wants to buy it, it's a bad decision.  Unlike the Wii with it's motion controls or even PS4/Xbox 1 with superior graphics and media capabilities, WiiU has no appealing features (beyond Nintendo games and playing off the gamepad when TV is otherwise in use which they should really promote more). And the gamepad is more of a sales hinderence (both in initial appeal and cost to system) than a novel game changer.