An unlikely cultural project is brought entertainingly to life in "Stars," an engaging, often hilarious portrait of a Buenos Aires slum that offers its inhabitants as actors to the movie industry. Pic is sprinkled with bright perceptions, mostly in a comic key, but its tight focus on the shanty-town Svengali behind the project robs the docu of any broader, deeper view. But as a feel-good piece on the transformational power of the movies, "Stars" works fine, and its upbeat message could shine…
