It's got to be the Xbox One. From Adam Orth's tweets, the disastrous reveal, the DRM policy and reversal, followed by resolutiongate, all of which took place before the console was even released, it was such a tremendous clusterfuck. Finally, the console was released and even then the problems didn't stop. Borked Kinect commands, MIA Twitch service, Skype bans for foul language, a revised party system that reworks the 360 system (which worked just fine) into a confusing, counterintuitive mess, microtransactions in all of the first party games -- the hits just keep coming.
I've been an Xbox gamer my entire adult life so I bought the system anyway, hoping all of the hubbub was just prelaunch complications that would be worked out by the time the system got into my home. Nope ..the bad news just kept coming. Microsoft is hopelessly out of touch and I really can't see how they could manage to maintain the popularity they had last gen. Time will tell of course, but as it stands, the system seems like it will be a wash, and may even cause MS to leave the console space behind.