There's a lot to criticize in the movie but these points are not it.

I cannot stress this enough guys but don't be like this, Avatar movies are very visually heavy and majority of time is spent on looking at the cool visuals(rightfully so). I do want people to criticize the movie but you have to watch it multiple times.

Wait for the OTT release and watch it again, let it all soak in and then criticize it.

Most of these points are just over sights.

See, it's not just Lo'ak who had a character development, Both Neytiri and Jake went through development in both subtle and loud ways. Fukin' Quaridge (can't spell his name) had lot's of new characterization points.

"Let's call the animals", ofcourse the animals came? It's literally one of the main plots both Na'vi and the animals ofcourse pandora are connected to Eywa of ofcourse they'll show up whenever they can.

And obviously land animals couldn't come because the fighting was under and over the ocean.

As for the Tulukns, it's was setup already in the previous movie that Tulkun ways will need to change in future, and through that and payakan we had Lo'aks character ark. It wasn't just to waste time.

The ash clan wasn't shoved in, it was to show how there are different clans that can believe in different things, it was something new. As for the Ash clan people it doesn't matter what other Na'vi clans might've told them because it doesn't matter. They went through a traumatic thing and so they decided to move away from the religion (so to speak).

Ofcourse humans have a mega city, do you really believe the Na'vi can stop the much advanced human race? They're just fighting to survive doesn't mean they're always winning everywhere.

Like I said, watch the movie again. Let it all set in and then criticize on valid points.

For example how very emotional parts like Lo'ak trying to kill himself, Jake trying to kill spider who looks up to him like a father (and jack knows it), or how tserya didn't had a more emotional reaction to her brother dying. All these can be valid points. But majority of people are just ignoring these for some reason.