This game is grossly underrated, in my opinion. Nice rule set, hard to complete both paths of the adventure, multiball, good flow. Like others have said, the movie being considered one of the all time bombs did not help, nor did the machine launching months after the movies release. Everyone who gives the machine a try enjoys it.
I did do one small change to the settings, I made sink the Deez obtainable only by completing three in a row on the board, its not in the random awards anymore so you really have to work for the four ball multiball instead of it just being given to you. I am waiting for someone to retheme a Waterworld into a Stranger Things; when the Deez flips you enter The Upside Down and have to get all four kids together to escape. It would be pretty sweet, imho.
If you have not had the chance, check out the extended directors cut as it improves the movie greatly. It is almost like another movie complete with "different" ending.