If you're like me and you read the Edgar Rice Burroughs books first, you're in for a bit of a shock. This Disney movie freely borrows from at least three books of the Barsoom series, and adds major twists that aren't in the books. But that doesn't make the movie itself bad. It has that authentic gritty feel to it that good scifi movies should have. It's got humor, action and even a bit of love. The world of Barsoom is great, the Tharks awesome, the white apes terrifying. All in all an enjoyable experience!