I liked the movie and recommend seeing it in IMAX 3D. I was entertained for the whole 2 hours 40 minutes; however, elements of the movie were similar to other movies. The story was similar to other movies. I discussed this with my son, who said the movie's story reminded him of Ferngully.
The big machines were similar to the ones in the Terminator and Alien series. The 3D effect was used effectively, and never detracted from the story. The movie should get an oscar nomination for visual effects.
I saw this movie with my wife. After it was over, I said that I had wished that I had waited for the DVD; I was surprised to hear her say that she thought it was pretty good and was much better on a big screen. My wife pointed out that the movie had just as many thrills as a big budget movie. I had seen the reviews of the movie on Yahoo, and was expecting more. She saw no reviews, and enjoyed the flick for what it was - a low budget creepy thriller that delivered.