Probably the original Xbox. It established presence in the market, allowing for its successor to do quite well, and it also had some iconic games. Series has shrunk the market share considerably, and no wonder. The original Xbox probably didn't do too poorly regarding its objectives, wheres Series has probably done absolutely terribly. Short-term financial success is probably the only clear thing going for Series over the original - which isn't to downplay it, but that financial success doesn't really seem like it's resulting in a good future for Xbox (and to be clear, I don't know how successful Series has been financially, but it's probably better than the original Xbox's).







