As a huge fan of the book series and a person who has read them time and time again, this was a huge disappointment and did not remain true to the books. I understand that as an adaptation things need to be changed, but I would honestly put this movie along side the live action Last Airbender... Way too much of the story was changed in ways that made no sense and cut out very important parts. The only thing i enjoyed about this was Josh Gad as Mulch Diggums, and the fantastic CGI and effects.
If you want to see what i mean i would highly recommend the actual book series or the graphic novels, both were fantastic.