Simple question, what's more important to you in H2A?
Campaign and it have a plethora of features(achievements, graphics, CEA style graphics switching, terminals, co-op, etc...).
or
Multiplayer(full mp experience that we know of, with upgraded graphics. Ranks, ranked/unranked playlists, full map set, etc...).
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It is all about the multiplayer. If someone wants to play the campaign they can still play the campaign on the old disc however you cannot still play the multiplayer on XBL. As long as they leave the multiplayer untouched all of the players who joined Halo after halo 2 will get to see why it is considered to be the best most competitive Halo multiplayer ever,