Halo 3 was released on 9/25/07. It was about as big as an election for a new president.
From the moment I payed over my money, I knew it was a $60 dollars well spent. Halo 3 absorbs you into the gameplay from the first opening cutscene. It is truly an amazing game. Its online multiplayer will keep it thriving for many years to come. The content available for this game is above average. There is a new map pack now available, many documentary videos from the creators themselves (Bungie), and themes and Gamer Pictures. For this thrid installment in the series, they added online Co-op, customiziable online figures (you can be an Elite model or Spartan model, choose the colors, and an emblem), a map-editor named forge, and a new theater option that lets you view, save, and share videos of games you played with your friends.
Overall Halo 3 is a MUST GET.