Remedy's Masterpiece
Alan Wake is definitely well worth at least a single playthrough. It is an experience with few flaws that can be overlooked in comparison with how superb the game is overall.
The story of Alan Wake deserves a lot of praise because each episode manages to feel like its own story with a beginning, a middle, and end, while all six form a thrilling story arc about a writer, a kidnapped love, and a fight between the light and the dark. The setting is well realized thanks to the detailed environments, the gorgeous vistas, the characters that feel real when you approach them, and the radio and TV shows scattered through the levels.




While the game at least warrants a rental, I highly recommend the limited collector's edition of the game because it comes with a book containing Agent Nightingale's field notes and other literary oddities that, while not required to fully enjoy the game, certainly augment the experience.
If you haven't started playing it yet, then go play it soon. If you have started, then go finish it.