Nintendo: WiiU. Just a culmination of increasingly worse consoles starting from the N64. I know it will ruffle feathers that I think since N64 Nintendo hadn't done a quality console, but that's just my opinion. The Switch reverses trend that entirely. I just wish there were a TV only version for $199.
Sony: PS3. I still love the crap out of every Playstation, mainly because it they always have crap tons of RPGs, but it is my least favorite.
Microsoft: XBONE. I don't even know why I still own the thing. The only game I have is the Master Chief collection. It literally does nothing I would want it to do.