Yes, it will be another failed alien movie... the alien invasion is never successful. It's so sad, all that planning, all that advanced technology, and the pesky carbon-based ape people always somehow win the day. Bleh. I thought those chaps from War of the Worlds were off to a good start - even beginning terraforming this soggy rock into something more extraterrestrials pleasing - only to be brought low by Earth microbes?!? Pish.
The Hitchhikers Guide to the Galaxy, that movie got it right. Just poof, and the whole planet is vaporized. That's doing it right! None of this piddling around with attacks on individual population centers... it's too slow and gives Will Smith too much time to find our Achilles' heel.