Is this game good because of it's graphics? No. How about it's controls? No. Story? No.
What does make this game good is the simple yet surprisingly addictive gameplay. Just the constant barrage of creatures, robots, and ships ever stacking the odds against you. When ever you survive it feels like you actually accomplished something. It's also great to relish in the gameyness of this game. It makes no apologizes for being nothing more than a simple objective with a single means to complete it, with no other strings attached.
I mean don't get me wrong it's got it's faults. Almost N64ish graphics, sluggish vehicle controls, and an engine that is no stranger to slow down all are annoying. But not ever annoying enough to ruin the fun this game can bring. It's a great game to get another person, drink some beers, throw on some cheezy death metal, and go to town.