Illogical premise means the realization it wasn't worth watching

Rating: 5/10 (11 October 2012)

***** REVIEW CONTAINS SPOILERS *****
DO NOT READ BELOW IF YOU DO NOT WANT TO SEE SPOILERS
I had a big problem with the premise of the movie.
The alien just wanted us to give it its square "blocks" so it could build its ship and return to its home in outer space.
Without that, there would not have been all of this violence on Earth.
Neither would there have been a movie premise or a reason for me to waste two hours of my life watching this ridiculous movie.
In other words, if the military had done the reasonable thing and safe thing -- give the alien back its ship so it could stop the violence on Earth -- there wouldn't have been any premise for a movie.
Thus -- stupid movie, stupid premise, stupid waste of two hours of my life.
Who cares if the kids were cute and they were making a movie? J.J. Abrams bases it on a very flawed premise, then he stretches it out much longer than he should ever stretch such a thin plot, and thus he end up with a boring, disappointing movie.
It has creep factor, and great special effects, I'll give it that. Too bad he didn't do a better job with the basic premise and the plot.