Avatar movie in 3D
That was amazing. I think the gizmodo review got it right. There's not much point talking about the plot, or for that matter the science. But the visual reproduction of an alien environment that really looked and felt real, was accomplished. And I can include the whole panoply of living things that swirl around in that jungle for the first time, including the humanoid aliens. The forms and iridescence of the creatures were chosen to grab attention and impress, but they were plausibly real.
I can't think of one time that I was pulled out of the visual and visceral experience by something that looked fake.