Master chief is back and he's never looked better. The new enemies are great and require strategy to beat. Playing on harder difficulties really makes you appreciate the new enemies and their abilities. There's a lot of variety in the missions that keep the campaign fun and keeps you wondering what's coming next.
Multiplayer is as fun as ever, 343 did a great job with the maps. Weekly updates keeps the game fresh with new maps and game modes. Can't wait for them to start adding forge maps and game types made by the halo community.