The story would seem to provide the perfect political straw man. In the place of easy targets are complex characters that make you laugh and ponder their actions - sometimes all at once. If there is any misstep it's in the odd camera pans and still shots of interior and exterior shots for no apparent reason. No matter where you fall on the political spectrum, this is a must see film.
Maybe it's all a gimmick, but the difference between Locke and other similar setups (think Buried, a film I also really liked) is that the stakes are high but not far from reality. Heavy handed at times, for sure. In the end we get the look at a man who wants to do the right thing even if it ends up costing him everything.