I really enjoyed the film, didn't feel like a 3+hour film, visually it was beautiful, 3d was 3d didn't really add anything for me personally but when done well like in avatar i guess it's a fun change.

There were a few issues I had with the film though.

1. where did all the water navi go at the end? They just straight up disappeared lol.

2. why were all the kids using earth slang words like bro and cuz, didn't really make much sense or fit in with the avatar universe.

3. the whale brain goo stuff, only being worth 80mil lol, seems like something that stops human ageing would be worth a lot more. (This is a minor nitpicky issue I'll admit lol), they don't explain how they randomly discovered this either considering how much effort it takes to get, and they leave the entire corpse after also so seems like a very specific thing to get without knowing about it prior or discovering it whilst they farmed whales for other purposes.

4. this is probably the biggest one for me. They downloaded the bad guys memories and then put them in avatar bodies. So basically there is no risk/reward factor to them dying now as they can just come back with a new avatar body repeatedly. Making a big deal of the main bad guy seemingly die and then be saved doesn't have as much impact when he could just come back anyway (granted his memories from last download to death would be missing, but you'd assume they'd download regularly).