I saw it with by friends a while ago and it was pretty thought provoking, like, what was the deal with those blood-root things? were they trying to terraform the earth? But I can see how the aliens could overlook the microbes etc, We humans can only see them with the help of microscopes and the like ourselves, If they're observing us from space, it'd be even harder for them to see 'em, on account of how far away they are. but anyway, The movie was awesome, and I can't wait to see it again...

I love it when people collapse into litterboxes