Personally,I will start with the campaign since it is the Halo story and actual game. I predict most will say the same,but don’t be shy to say you go into MM,which I do second,or customs and forge.
What will you do?
CAMPAIGN -Yoinks!-
I will watch the entire intro, which most of the people I know are used to skip because they cannot wait to play the multiplayer, instead of the campaign.
after watching the intro video, I’ll go to the Forge lobby, and see the names of the maps which will be in the game. Then, I’ll start forge to see if there’s something new that has not been announced, or just to try Forge 3.0 .
After fooling around in Forge, I’ll invite my friends from real life to play a custom Slayer Free For All game on a map I might like to beat them in the multiplayer they’ve been playing all day long (:
after the game, I’ll start my solo-heroic/legendary career.
LIKE A BOSS.
First i’ll put in the disk…
But seriously, first i’ll play campaign, then forge, than mm, then ff, then ? (They may add a new section, kinda like they did in odst with ff).
Campaign, of course. I don’t play anything else until I beat campaign. Even in Anniversary, when I already knew the whole story having already played the old CE, I still wouldn’t touch multiplayer until after.
I will play multiplayer have a look at forge then settle in for some time with the chief. I hope I never here him say, “Tossing one” kills me every time, sounds like he needs a private moment. 
> OMG Sweet new story trailer!
>
> [edit] Forgot the link…
>
> Link <mark>Youtube</mark>
That is LEGIT. lol!
I’ll play first five games of multiplayer to feel what it plays like , Then I’ll finish the Campaign and go back to multiplayer
I’ll play both the campaign and the multiplayer over at a friend’s house just to see if it actually is playable before i buy it. If I buy it then I’ll of course start off with the campaign on legendary as I’ve done in the last two titles.
Well I’m going to play Halo: CEA, Halo 2 and then Halo 3 before the game comes out, to get my mind sunk in the story. Then I’m going to throw in Halo 4 and head straight into the campaign.
> Well I’m going to play Halo: CEA, Halo 2 and then Halo 3 before the game comes out, to get my mind sunk in the story. Then I’m going to throw in Halo 4 and head straight into the campaign.
I’ll play Wars, Reach, CEA, beginning of 2, ODST, rest of 2, 3, 4 
Get into a team based matchmaking game team kill until booted throw my tv out the window and then black out
Campaign first, then forge, then matchmaking.
I will go into Forge, look at the new stuff then play campaign. This is what I have done since Halo 3.
I personally always start with the campaign of any game on a medium-hard difficulty, then I play multiplayer for a while, then I play the campaign on the hardest difficulty possible.
depends if i get it or not
if it has armor abilities, and no 1-50 rank system then hell no
Campaign. From beginning to end in one day. No breaks. Its become tradition with me since Bioshock 2. Games beaten like that: Halo 3: ODST, Halo: Reach, Bioshock 2, Gears of War 3, Halo: Anniversary, Skyrim, and Assassins Creed: Revelations.
First I will change my pants
Then I’ll go to campaign on normal 'till Im done. Then multiplayer, then co-op, and so forth.
I shall -Yoink!- with excitement, then write a song about it, then play campaign