aliens cross interstellar space to a planet 70+% water...

Rating: 1/10 (13 July 2006)

and then die from any contact with the stuff. Right. Next time maybe they'll just nuke from orbit... or go for Mars, instead. Hell, just drop a few large asteroids and wait for humans to die out.
This film is just about the most ridiculous alien invasion film since Mars Attacks - unfortunately for M. Night, Mel and company, this film wasn't trying to be ridiculous. This movie would have been MUCH better had it stayed with the "unseen menace" approach. That worked well in another fialed film effort: IT. The first half of the movie is solid and then it just falls apart when the threat is solidified and made real. Unfortunately, this is even worse. There is NO explanation why aliens, who can cross interstellar space, are vulnerable to the most common substance on the planet they invade or why they are apparently incapable of harming human beings.
Another commenter says this is a movie about faith. Well, I used to have faith in Shymalan. Maybe he can regain it... but this movie is crap.