I'm writing this on the very same day that I'm ordering new Sony lenses for my beloved Sony Alpha a6300 camera, so you could say that I'm a Sony fan. However, any good electronics company has to take risks with their products to stay ahead of the game, and Sony has definitely taken some risks that have ended up as failures.
The saddest flop is definitely Aibo, the robotic dog, simply because these were really cute. Now they're all dying because Sony has stopped repairing them. RIP robot bois. How well do you remember these other unsuccessful Sony products?