Here we go. Now it's the new trend from Nintendo detractors to dismiss whatever complain or criticism against anything negative toward it calling it "persecution complex" as a punchline for antagonizing.
I agree with the OP. The bad press against WiiU was huge. Sure, there's a lot of reasons for some of them are valid... if they started after WiiU's under performance. But, it actually started even a year before WiiU's release. Of course the detractors will solely blame Nintendo's mistakes for this and will justify the bad press using it as reason, but the bad press coming out before the release was definitively unnecessary.
Emily Rogers made an article about this. This negativism, without a doubt, took major damage on WiiU's reputation. Here's a huge list from bad press against even prior to WiiU's release. I strongly recommend seeing the enormous list of bad press against it from June 2011 till May 2013.
http://www.notenoughshaders.com/2013/05/18/wii-u-two-years-of-negative-brand-momentum/
*Read the list*
Gosh, man… I don't think this is just negativism based on WiiU's underperformance as the reason some are trying to point at, it was big already even before the system launch. The underperformance later was the excuse needed for the detractors to point the reason at to cloud the bashing against it and sounds like were reasonable commentaries. I agree there was somewhat of a "self fullfilling prophecy" from some sections of the media to actually see it falling.
Of course there was negative reaction to the product before it launched. It didn't materialize out of thin air on launch day.
All the reasons to be negative about the product were not fabricated by the media. They were entirely the fault of Nintendo.
Prior to launch, Nintendo left Wii to die with no software for the last two years of its life. They then told everyone that this was the next Wii.
Prior to launch, E3 2012 confused people as to what the Wii U controller actually was. Nintendo showed no compelling game for it.
Prior to launch, at E3 2013, Nintendo still showed no compelling reason for the Wii U controller to exist. Nintendo Land fireworks were met with complete apathy.
Prior to launch, Nintendo was pushing "expanded audience" software to an audience that had already migrated to smartphones and Facebook.
Prior to launch, everyone knew the console would be powered like the PS3/360, which made its non-existent third-party support a safe bet.
Prior to launch, nobody saw the requisite advancements in online from Nintendo. As underwhelming as it looked, their flagship multiplayer title, Nintendo Land, was still offline only.
Prior to launch, this underpowered console that was launching was priced higher than comparatively-powered hardware.
Prior to launch and most importantly, Nintendo showed zero new experiences that they would be offering on the console. NSMB4 and more minigames were the flagship titles. They were going to be followed by more Fit, more Sports, and Game and Wario.
This isn't a media conspiracy. It's not even a story of bad mouthing that got out of hand. This is the story of an undesirable product that the media recognized as undesirable when it was first shown.