I have to admit, I think I preferred ODST to Reach. Maybe it's because the former was a genuine risk and forced Bungie to develop outside its comfort zones. Or maybe it's because ODST's cast is compelling and likable, rather than a collection of bland stereotypes. But whatever. ODST is now just £7.65 at Amazon, which means in a few months or so I see it hitting a fiver. If you haven't played it, I don't really know how I can convince you. It's typical Halo, although in a pseudo open-ended setting. The direction of the narrative is genuinely original, and enough to warrant at least two playthroughs.