Without a single down, the MGS series. They are each masterpieces, each divulging into different, interesting subjects such as memes, genes, scene, the illuminati plot, gene manipulation, the violence of warfare, the irrelevance of enemies, and the morality of warfare, to name I few I spotted. Each character has a past, hobbies, ideals; all of these things make me genuinely interested in them, and genuinely saddened if they die. The gameplay itself is fun, intuitive and free. Various strategies can be used, and using the various items is easy, and quick. The Codec provides the most interesting system I have seen so far in a game, allowing for a hints system as well as a means to know more about the plot, various characters, items, weapons, and current objective. There is no need for a compass, an objective screen, and other such things. Just the player, the pause menu, and the Codec. All of this is without mentioning the perfect timing of the various jokes and puns, and the pure devastating emotions blows the series inflicts upon you.
People that say that the series is boring, and that cutscenes are long, miss the point of the entire Saga completely. I dare anyone who has played all 4, (not 6, don't worry) games, to respond, and tell me they didn't cry, or come very close to at any point during the series.