2) I enjoyed Navi characters which seemed to be very intelligent, yet have a purity and raw animalism about them - especially the main female character.
3) Some great adventure.
What I didn't like:
1) It was too predictable - that Jake would eventually find that the "greedy" humans were on the wrong side and he would be converted to become a "pure" Navi.
2) The not so subtle new age messages.. mother earth goddess tree, we are one with nature, the pure utopia that could be obtained if we change our ways..