It's short, nonsensical, and repetitive. I can't wait to play it again.
Insects and robots have, for some reason never explained, teamed up to attack Earth. Good thing you bought Earth Defense Force and not Grocery Store Employee or this game would be even shorter. 3 chapters, 5 missions apiece, 10-20 minutes per mission. Hold down R1. Watch for ticks.
The game looks like an HD upgrade of a PSP port. Buildings tumble into jagged-edged pieces as they fall. Poorly-animated ants stomp around and then vanish when killed. Ticks explode, which biologically makes no sense but then again there are giant robots here too, so "making sense" isn't really a selling point.
On paper, this game looks absolutely awful. But with a buddy and a 6-pack, this is the greatest, most mindlessly fun game ever. You'll laugh as AI soldiers shout "EDF! EDF!" Hold "who can blow up the most buildings" contests. Do tick-checks on each other.
This game is stupid. But I love it.