Fabulous special effects on 3D and worthy of praise for that alone. If you're an amateur naturalist like myself, the wildlife, plants and landscape are also wonderfully realised. Not quite so keen on the plot and consider if humans did come across such a beautiful planet in the future, they would be extremely unlikely to trash it. Perhaps I have more faith in humanity than most. The somewhat hippy, native culture thing going-on with the Navi was a bit corny for British-taste I'd say. Overall, a good movie though.