Visually beautiful, though the human actors on screen look a little off in the movie. Worth to watch once in theaters. Prepared to be wowed.
Then comes the plot (no major spoilers)...
I would give the plot 1/5 (tbf, I thought Avatar 1 was 2/5 plot). It is just not a great story, a bad rehash of white hero saves natives with really flat kids (they are annoyingly bland). I will probably never watch it again, as I watched the first Avatar before going to the theater and realized how weak the plot is.