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That is quite the claim. Previously when people tried to tell me the name was the main problem we get to trot out the awful support from library makers, awful online, extremely suspect hardware design and more besides and that would speak in part to things other than Nintendo's approach.
The Dreamcast got some great stuff before its demise but I am not sure what I can really compare between them. They would seem to be rather different worlds and rather different causes from where I sit.
Both systems lacked features that the other competitors had, but that by no means made them bad consoles. What they lacked in, they made up for in innovation to set themselves apart.
Of course, the Wii U will likely never achieve the "Legend" status of the Dreamcast and it's huge fan base ( me included ), but the Wii U was a great system that could have done much better, had Nintendo marketed it better, and given the consumers what they asked for along with what Nintendo wanted to do. Instead, Nintendo tried to force on us what they would like us to buy, not what we actually demanded. In the end, Nintendo ended up paying for it, dearly.
Essentially, the biggest difference from the Dreamcast to the Wii U, is that while SEGA gave its costumers what they wanted: a fantastic console, superior to the competition and full of their favorite franchises and games, Nintendo didn't give the software part of the deal.
Unfortunately, the Dreamcast failed due to a combination of bad marketing, piracy and lack of support from retailers.
On the other hand Nintendo: I don't want to play motion controlled bowling. I don't want Mario bowling either. I want the standard Mario games I know and love, but I also want to play Battlefield 3 or GTA.
Nintendo gave its costumers an awesome console, but didn't give consumers the software that they wanted. Nintendo thought the "gimmicky" and other cheap to produce motion control games, was going to give itself a second Wii Golden Age.
That wasn't the case. The hype and novelty had died down. Kind of like 3D movies. Or Pokemon Go.
Nintendo got greedy and went as far as to headbutt with it's own costumers, and ultimately paid the price.