I would see this one twice..

Rating: 9/10 (7 July 2005)

You'll have to suspend your belief system for this one (as you must do for 95% of all movies). Don't get caught up in the fact that certain things don't make "sense." If Aliens truly did invade us, trust me, many things would be Unexplained.. Therefore, just relax and imagine that this could really happen and then be prepared to see a scary movie.
However, here is a simple explanation as to why you think the outcome was the way it was: I think these aliens were arrogant and didn't respect us. Anyone know what arrogance will get you when you don't respect your opponent! In addition, perhaps microbiology isn't an issue from the planet they are from, therefore, the aliens wouldn't have any specialist in this particular field, or it just didn't occur to them that germs would be a problem on Earth since its not a problem on their planet. Or it could be that when they buried their equipment 1000s or millions of years ago, there was no germ problem and they didn't bother to check again before they returned. Again, these aliens are basically terrorist and didn't respect us just as we don't respect ants. In addition, one might wonder why they didn't come up with a more efficient way to destroy us, but the fact is that they needed to kill us one by one and basically use the rest of us as nourishment for the terroforming they were conducting. Maybe it will take them 3, 5, or maybe 10 years to kill everyone, but the result is for the use of the Earth for potentially 1000s of years to come.
The point of all of this is the fact that since the movie didn't explain any of this its fun to come up with your own ideas about why the aliens screwed up, why they are here, why there technology is flawed, why certain cameras work and others don't..etc etc If you're imaginative and don't need someone to explain everything for you, then you'll enjoy this.. this is the difference between those that like it and those that don't..