I agree Evan, I wish they would expand more on the space combat. Think about it, Bungie making a solely space combat game with awesome multiplayer, it'd be like Starfox 64 on steroids!
Anyways, I think the space combat is awesome and yes it is only one short mission, which kinda bummed me out, although it has me kind of excited to see what else Reach might have in store with its Campaign.