I finally watched Moon (hooray) and I unsurprisingly loved it. What I particularly enjoyed wasn't the acting, the effects, the direction or the plot (which were all fantastic) but the way the story was told.
Douglas Jones gave a great deal of credit to the intellect of the audience. There was only one key scene of exposition that I can recall. Generally the story was leaked carefully out in subtle ways, through videos watched, or the ways characters acted. Huge clues were given that you in no way had to pick up on but surely will on a repeat viewing. By the end you had come to a lot of your own conclusions as to what happened, why it happened and the motives of the characters involved.
It's one of those few films that will actually get better on a second viewing akin to Memento or Primer. Both were also told in complex ways, Primer particularly thanks to its creator's refusal to 'dumb down' the plot and its subsequent near-impossible-to-follow story. Moon may not be quite as complex as either of these two but was in many ways far more subtle and I'm desperately looking forward to rewatching it to see just how much better it will be on a repeat viewing.