In only four weeks since "Girls" premiered on HBO (Sundays at 10:30 p.m. ET), Lena Dunham's half-hour comedy about post-college life in New York City has experienced virtually every phase of the TV hype cycle. Critics praised it as groundbreaking and important before it even premiered, but it quickly became a lightning rod of controversy and discussion as viewers have zeroed in on its lack of diversity, privileged characters and awkward sex scenes.