Ishtar ranks with Battlefield Earth or whatever it was called... Waterworld is actually watchable, sort of, particularly if you are drunk or have just had a lobotomy (Ishtar you can watch if you have had your brain completely removed)
Battlefield Earth--is that the Travolta debacle?
All I know is that we rented Waterworld, and despite being a sailor, I fell asleep within 30 minutes.
And I only watched Titanic for the real underwater shots (and fast forwarded through the rest). The plot can be explained this way: she lives, he dies, the boat goes down. I can't even begin to explain the plot of Waterworld.