John Carter is a war-weary, former military captain who's inexplicably transported to the mysterious and exotic planet of Barsoom (Mars) and reluctantly becomes embroiled in an epic conflict. It's a world on the brink of collapse, and Carter rediscovers his humanity when he realizes the survival of Barsoom and its people rests in his hands.
Totally forgettable and full of stereotypes
Edgar Rice Burroughs wrote his series of John Carter novels before space flight was more than a fancy. This movie is more adventure and romance and very little (if any) actual science.
This movie is the best production of A Princess of Mars, the first story in the series, that I've seen.
If you're a fan of the John Carter novels then you will probably get some enjoyment from John Carter. While there are some differences you'll meet some familiar characters and recognize quite a few relevant plot points.
Not a great film, but not a bad one, either.