So you don't care what it is? If they never explain it at all, or if it's going to be some nanotechnology future robot machine, it's dumb.
IMO they are making ridiculous shit up as they go and they're hoping they can fix it in the end or get cancelled before they have to.
The flashbacks and the human interactions are far and away the best part of the show. The actual weird shit that happens on the island is kind of dumb, unless they wrap it all up in something at least slightly believable.
