Fantastic movie but leaves a lot of unsolved fundamental questions

Rating: 7/10 (13 July 2013)

I should say wow! It was a great movie (action scenes, story, visual effects, acting and directing were all great) and I enjoyed it a lot. But..
This movie deserves a rating of 8.5/10 but I give it a 7 because of its very poor management of fundamental questions: 1. how is it possible that nobody investigates these prawns to know what is their mission? why have they come to Earth? who is their captain? what's the problem with their vessel? 2. I definitely don't get why no one tries to learn their technology and reverse-engineer their vessel or operate it or AT LEAST FOR GOD'S SAKE FIND OUT HOW IS IT STANDING IN THE SKY ???! 3. why doesn't anybody help the prawns to fix their ship and return home, and maybe take some of humans with them to their planet and ... These questions drive me nuts..
But you should watch the movie..