At a fundamental level, the plot has potential. Two aliens, one bad, one good, but you aren't sure which is which until the end of the film. Clues point in different directions (especially the girl on the swing part).
It's a low budget flick so don't expect much on special effects. That may be an understatement.
The problem is that it is really hard to suspend disbelief when so much of the movie borders on the absurd, and most of the acting is so awful. The frat boy scene introducing the brothers is unconvincing but at least short. The military part at the base is in part ruined by the overacting and unbelievable stupidity of the officer in charge. And then come the aliens, one with tattoos and leathers and the other in something that looks like he crawled out of an army navy surplus store. Hoses are are everywhere. He wears a holey summer shirt with a couple tears that apparently repels armor piercing bullets. It's a see to believe mess.
The fights are worse. Bullets are bouncing off the aliens, one of whom has a little shield that he waves around that nobody can miss. An RPG (what is Mr. Redneck doing with an RPG?) is used to threaten one of the aliens, held about 2 feet from him -- as it if wouldn't blow up the hero as well. The clunk clunk fat guy gets delivered in an ice cream truck. No, wait, a bulletproof car comes first, then the ice cream truck which has some awful fake bullet holes in the side. They run through a squad of soldiers like a knife through butter -- somehow the vehicles are bulletproof, then, in one of the funniest scenes of the movie someone hits the rear bumper of the car and it falls off. Just... falls off. Nobody in these elite military squads can hit the tires which survive the entire encounter intact. How much budget does it take to deflate a tire?
Its not that bad of a way to pass a boring night, primarily because of edgely (at least if you are male), but I'd have a hard time recommending it to anyone.