How bad is it? It's not the worst mock-buster from Asylum, but that's faint praise.
Should you see it? No.
This was quickly made to capitalize on the recent release of the remake of the 1951 classic "The Day the Earth Stood Still." This manages to steal the plot as well as title, by having the aliens say they'll destroy Earth unless we prove our worth; a lawsuit by Fox, however, did not pass the "satire is not theft" test. The aliens are so poorly done that they do not move and are actually called megaliths. The main attraction of the film is Sinead McCafferty nude; when she tries to act, the film slows. C. Thomas Howell stars and directs, there's a blink-and-you'll-miss-it cameo by Judd Nelson (who gets second billing) and Bug Hall, who had an interesting career as a child actor, shows that adulthood did him no favors. Christianity fails to sway the alien, but a woman dying in childbirth - who then gets healed by alien magic - does.