Halo: At Its Finest
Reach's main shortfall is the length of its Campaign. Visually, it is stunning, blowing every other Halo game out of the water. The story is mindblowing and engaging. Most of the characters are interesting. The only problem, however, is it is too damn short. Yes, first person shooters are more of a multiplayer domain, battling against friends (and enemies alike), but for those who find the Halo lore and mythos fascinating (myself included), you will be left wanting more.
Although it is a short game, it is well worth the buy. At the very least, rent it and check it out...