“A Princess of Mars” and all the John Carter books were big favorites of mine as a kid - one of my earliest memories is reading the Dell Comics adaptation in 1964.
I saw the movie and also thought it was pretty good. The Tharks were well done, the SFX of Carter’s enhanced jumping and strength were good, the actors were pretty good (including the two who played Julius Caesar and Marc Anthony in HBO’s ROME), I thought it was money well spent and my kids really liked it.
Part of the problem is that filmmakers have been mining the original books for years - Star Wars, Flash Gordon, Buck Rogers, even Superman (whose ability to fly was originally an ability to jump long distances due to growing up on a higher-gravity planet - Siegel and Schuster probably borrowed that from John Carter, along with elements from Olaf Stapledon and Doc Savage), and arguably even non-SF works like Dances With Wolves - so what was original and fresh has now been seen a hundred times over.
I still liked it. It was done with affection for the original story.
Weird trivia: I used to drive past Edgar Rice Burroughs’ grave all the time when I was living in Los Angeles. He is buried under a walnut tree outside the business office for his estate in Tarzana (a suburb which is named after Burroughs’ most famous creation) visible right off Ventura Boulevard up in the San Fernando Valley.