AS I've said to you guys before, I missed the whole Halo thing and so it's just too late for me....hope you guys enjoy Reach, though!
Reach is a prequel to the entire series, so you could always give it ago if you so desired. Even if you have no interest in the campaign and such, Firefight mode (Halo's equivalent of Horde) will be awesome.
Speaking of which, Beav and Imps, we will have to commit some Covenant murder together soon.