They have not destroyed the name of Halo they have raised it to a whole new level The campaign is extremely fun, and not too long (8 missions). What I really like is their company name, as it is a reference to 343 Guilty Spark, a large contributor to the Halo universe. If you have been a fan of the Legendary trilogy of Halo through its duration, you would have, like I, been coming into this whole new introduction expecting (and maybe hoping)for it to crash and burn. As a new twist, the Master Chief will be working together with the Spartan IV's the replacements to the Master Chief. Also aside from the Prometheans, Cortana is turning rampant and has begun to turn on the Master Chief. However despite being made by the Forerunners the Prometheans have a much darker and more sinister plot. The Prometheans are AIs created by the Forerunners to protect a planet.
In Halo 4 we see a new breed of enemies called the Prometheans. John wakes up to Cortana screaming "John I need you!" This creates the beginning of a new saga. The game starts where you last left off in a torn in half ship orbiting a planet around four years after the events of Halo 3. At the end of the legendary mode of Halo 3 we see Master Chief Petty Officer John-117 orbiting a planet and hear him say to Cortana "Wake me when you need me". This saga is known as the Reclaimer Saga. Halo 4 is the start of a new saga in the Master Chief's story.