Pros:
• Great cast, accurate representation
• Excellent special effects
Cons:
• they combine episodes from the animated series to fill their hour long run time
• they do not stick to the chronological order of events from the series
• They unnecessarily remove components of episodes, some of which are foundational to the story and could easily be left in the story.
All in all a far better presentation of the Avatar story and universe than the M. Night Shyamalan movie but still leaves us wanting. I'd give it a B- at best.