Halo 4

Played through this in co-op in one go and had an absolute blast. The gameplay variety was really fun, not everything hit but almost all of it did. I also really, REALLY liked the story, specifically the parts with Cortana. The Forerunner stuff I thought was a bit underbaked, and as someone who is reading through the books and keep seeing hints of this mysterious Didact that part was kind of underwhelming. But I still think I would put Halo 4 among my top Halo games!