Nintendo Wii: as a loyal Nintendo purchaser here from the Game & Watch, to the Super Nintendo, N64 and GameCube, but the Nintendo Wii never let me back up my purchased downloaded games in a way I could transfer to another Wii without online access. I get that that's now standard but it was the first time I was burnt by it.
Yes that's right, and I realised I could no longer be a historic game hardware collector with that generation of consoles which killed my main hobby at the time. Years of Nintendo loyalty and, dare I say it, fandom, were betrayed and the Wii itself was just awful.
Except that it's great to homebrew and experience literally everything it has to offer. It's the same with the 3ds. Turns out to be about the best handheld emulator out there, because of the extremely high quality buttons.