First of all let's get rid of that absurd notion that science fiction films of the fifties were merely a sub-conscious attempt to personify the threat from communism - this is a hackneyed idea, and far from the truth.
This is a thoughtfully crafted film, which like other good science fiction films of this era starts out portraying the aliens as monsters, only to reveal that they are benevolent and superior (how does this fit into the "Red Menace" theory?).
The screenplay was penned by Ray Bradbury and is full of very good dialog and ideas, especially the notion that we are not ready to meet such advanced civilizations. The scenes in the high desert are very atmospheric and creepy, and although the renderings of alien technology at first seem somewhat adolescent, there is a genuine sense of wonder when the internals of the alien ship are revealed. Something missing from today's, blase, computer generated, over the top, excesses.
The 3D is a useless appendage, and not worthy of discussion.
If you like science fiction pre-scifi channel and post-golden age, rent this movie and enjoy the atmosphere.