There were people who liked the John Carter books...and I don’t have an issue with them (hell, I used to read the Robert E Howard, Conan books) but the comic book sales from when John Carter was a (Marvell?) series should have been enough to tell anyone that this movie was going to flat-out flop.
Generally speaking, this film has no audience. It’s not scifi, it’s not fantasy, it’s sort of adventure.
Doomed from the start.
Movies about Mars almost aways flop. The only one that did well was Total Recall with Arnold.