Why this was a good movie
Roger Ebert wrote a book a while back titled something like 'I hated, hated, hated, this movie,' in which he included reviews of his least favorite movies. Few of the titles were surprising, but I was a bit puzzled by his inclusion of Rapa Nui.
Mind you, I wasn't totally surprised that he disliked the movie; after all, he panned Blade Runner (and then changed his rating later when it became an embarassment). No, it was the fact that of all the thousands of movies he must have seen, Rapa Nui stood out in his mind as particularly wretched.
Rapa Nui?
I read his review, and it was so incoherent I couldn't actually figure out any single thing he really disliked (he mostly talked about breasts). His main problem seemed to be that the people in the movie had quaint customs that seemed silly.
I was impressed by this movie precisely because it took me to a very different time and place, where the values and customs are unlike those of modern, first world people. Movies seldom do this so convincingly.
I've always loved classic science fiction novels, and this movie really felt like science fiction at its best: the heroes are trying to survive the death throes of a totally dysfunctional society. In fact, Rapa Nui was far more like genuine science fiction than all those action movies that use an SF setting to sweeten the violent sequences.
The plotting was very tight, with no pointless scenes or characters, and the story was engaging. The scene where they were cutting down the last tree in the universe (so far as they knew) for reasons that seemed compelling to them and yet were totally irrational, was really horrific.
And personally, I liked the breasts.