I liked Halo: Reach as a game, but it doesn’t seem to be possible to fit it into the rest of the canon established before it.

I consider the campaigns of 2 and 3 as one campaign, as they were meant to be one game, or at least most of Halo 3 was supposed to be in Halo 2. They weren’t, mainly because an xbox game couldn’t have all of that content if I remember right. Don’t cite this because the facts might not be exact, but it should be pretty…

If you read the books, you’ll most likely like Reach less. The Flood states that the Pillar of Autumn isn’t designed for atmospheric flight, and the ship is never on Reach in any of the books; the only atmosphere it touches iis Halo’s.