I think its a conglomarate of not having super software at launch, not managing to keep the stream of games going as promised during the launch window, the price vs current gen consoles and the internet hate on Nintendo.
As the price lowers and more quality software becomes available, im sure the system will be alright. The damage to the brand is done though, so it doesnt have a chance to compete with the PS4. Theres also the issue of western developers having blocked the Wii U in terms of engine. Now that we see the new consoles, it not that shocking anymore to think the Wii U is indeed as next gen as the X1 and PS4.
As some people have said, the controller might be a bit daunting for average consumers. They made it too big. It needs a redesign.
