if you think that girls gone wild is all that there is then you just didn't get it. Again it is satire.
yeah. though i would say it uses satire, but is not satire itself, per se. the shootout at the end was an amped up, hyperbolic portrayal of the 'no rules' depravity usually attached to spring break, something the girls work towards slowly, with the viewer pushed each step of the way into deciding what they're comfortable with.
even if the viewer didn't 'get' the attacks on youth culture, sexuality and exploitation (which to a point is not only acceptable, but encouraged by societ [e.g. 'titties, beer, project x fricking ruled!']) , but instead saw it as a straight-forward portrayal of what it was mimicking, i don't see how the viewer couldn't at least find the power shift between the girls and alien to be extremely interesting.