I like it so far. Most of the characters from the first three books are in here,but there have been some changes (again, no surprise). The Therns are introduced right away in movie, even before we meet our hero.
Tars Tarkas (Willem Dafoe) is already Jeddak of the Tharks, which is a bit of a change, which does work.
Lynn Collins, who was also in the Gambit movie. She's very appealing, I have to say.