Davis film critic Derrick Bang returns to Davisville this week to talk about some of the big December movies, including The Hobbit debuting Dec. 14, and Quentin Tarentino’s Django Unchained “southern,” which opens on Christmas. We also take up related questions about movies, such as the continuing slump in ticket sales. He blames the degraded experience of going out to a movie, including the pre-show commercials and mediocre presentation—but says the three Davis theaters do a consistently good job in sound and projection. Maybe that’s a selling point for a city banking on arts and entertainment as a major draw for downtown. We also get Bang’s take on the best, and worst, holiday movies through the years. His list of the best is thin on recent titles, compared to his list of the worst. A reason, he says, might be Hollywood’s fear these days of seeming corny or sentimental.