Good-natured critism ahead.
What my friends and I want to know is, who was the smartass alien who told his superiors to attack Earth? A planet whose surface is 70% water, and has high humidity in the atmosphere.
"Oooo! The planet is called Earth, so it must a dry planet right? We are so technologically advanced, but let us not scan the planet for potentially harmful liquid substances that might melt us."
Okay, okay. Maybe that was not how the conversation went, but good lord, whoever is their Intel is in deep doo-doo now. Despite this, we enjoyed the movie very much.