Synetic Theater is definitely one of the best companies around when it comes to capturing atmosphere. Their gloomy but striking take on Frankenstein, now playing at the Kennedy Center, may not have the gruesome gothic splashiness of their recent production of Faust, but its emphasis on movement and mood conveys Synetic’s signature style. For Synetic’s show, the story of Frankenstein has been stripped down to the basics, and though the dialogue can occasionally be clunky,…