I wasn't too fond of Episode 1, too many trial-and-error parts, (hated waiting for the elevator in the dark, and the final chase scene) but the second episode plays a lot smoother, has more interesting locales, and develops the story much more. If taken as a standalone game, ep2 is my favorite FPS of all time. Both games are about 6 or so hours long, Himu, from what I remember.