The recons with the elites showing up and the number of s-2s was very minor and forgivable. As for the battle of Reach lasting only 2 hours, it didn't; once the navy lost Reach for all intensive purposes was considered lost, but ground battles lasted for weeks. My big gripe was how early the battle began and largely went un-noticed until the main Covenant fleet showed up. Noble Team's existence wasn't really a big deal conically, except how Bungie decided to flesh out their back story; Kurt knew and even had a hand in Noble Teams creation. This bugs the hell out of me. In GoO Kurt is so broken over the fact that only two S-3s return out of the 600 he trained he decides to augment the latest class of Spartans with dangerous illegal augmentations to give them a better chance of surviving. If Kurt had been pulling out Spartans from suicide missions from the get go, I don't think he would have been desperate enough to do what he did with gamma company. As for the battle of Reach's depiction in the game, I understand it was from a separate perspective from FoR, but It was just too small and narrow a perspective to give the player a real feel for a planet at war(especially a planet that's supposed to be a "fortress among the stars")