Yeah, if they had not used an off the shelf part, then people would make fun of the janky controls with "levers and pulleys." The thing is a simple control scheme that's well understood and easy to learn. It gives inputs to an onboard computer which interprets pilot intent and steers the vessel (how ever questionable the vessel's construction might be).

Game controllers are used for all kinds of robots and vessels (often remote controlled) - so the fact they chose a controller does not weird me out at all.

Do I think they could have gotten a better quality controller? Yea, sure. Do I think maybe a wired controller would have been better? My gut says yes, but I don't know their decision making process and the engineering challenges with running cables.