Microsoft and Sony are competing for the same hardcore customers. These are consumers who actually care about horsepower. Nintendo is not trying to court this demo anymore because they learned their lesson with the Wii U. They're going back after the Wii market it sounds like.
The market is bigger than Neogaf readers.
I agree that Sony and MS are competing on the same grounds for the attention of the same consumer base. I do also think that consumers do care about "horsepower" if it falls within their budgets and can make game X on console A look better than game X on console B. It does also come down to what system is popular with the general circle of people around you... and the system with the biggest library. It is also very true that Nintendo has been trying to carve their own avenues in the game industry so they don;t have to compete with Sony and Microsoft on the same playing field. It worked with the Wii, and it failed with the Wii-U.
The Wii-U was never an impressive system from a hardware point of view, even at launch it was a mixed bag in comparison to what the Xbox 360 and PS3 could offer. In some ways it was better with it's newer GPU and feature sets, in other ways it was worse with its CPU performance. The price point and the initial confusion over the Wii-U being a new system or just an accessory didn't help the system gain any footing either.
The PowerPC hardware turned off a lot of third party developers and stunted growth within the indie scene as it limited developers to rely on Unity Engine.
The Wii-U had a really bad identity crisis that wasn't helped at all by droughts of software and a price point that looked less appealing than the two other consoles on the market. The system still has its gems, but Nintendo really botched things when trying to appeal to the right markets.
I agree that the market is bigger than NeoGaf, but consumers can still be swayed by popular opinion that can seep out of web forums like NeoGAF or communities like Reddit.