First off the movie lasts 3 1/4 hours with any intermission. That is impossible to watch with a break.

The story recycles many dated Vietnam War tropes, along with too many references to African and Oceanic cultures. At times, I felt like they were even ripping off from Jacques Cousteau.

The main characters from Avatar 1 are present, but they have grown up and are not that recognizable. Recognizing different characters can be difficult sometimes.

There is little resolution at the end of the movie, and no overt signs of a sequel. I saw the movie in 3D with glasses, but I don't know if the 3D was worthwhile or necessary, just another price gouge.

Would I watch it again, even to just see the parts I missed. I'm not sure. Overall, I found the movie anticlimactic and frequently dull.