Even though it's a Battlefield game, I have a compulsion and must play the campaign first. 

MP first, and campaign when I feel like it. 

Wait...there's a single player?

I always play the single player first, for any game that has singleplayer.

" Even though it's a Battlefield game, I have a compulsion and must play the campaign first.  "

" @Spoonman671 said:

" Even though it's a Battlefield game, I have a compulsion and must play the campaign first.  "

Yeah, I'm also pretty crazy about that. I was so bad I remember I wouldn't even play Team Fortress Classic until I finished Half Life.  I imagine for BF3 I'll get in one sitting or so of the SP out of the way and then play SP or multi depending on if my friends are on. "

Singleplayer just so I can get the feel for the game and not seem like an idiot.

I voted singleplayer because I usually start that way to get a feel for how the game functions.
With BF3 though.. I'm not sure. Depends on whether I get the game installed and ready at the same time as my friends or not. I'm not gonna play multiplayer before they're ready to roll.
 
I actually spent a few hours playing "singleplayer" in BF2 to try the helicopter and plane. Last thing I wanted was to look like an idiot with the Blackhawk.

Hmm... I actually hadn't considered it. It'll probably be the singleplayer if I am lucky enough to get in a multiplayer beta or two before it comes out.

Singleplayer in one or two sittings and then I'll move onto multiplayer right after. No matter what game I'm playing that has both modes, I will always finish  the singleplayer before moving on.

Bit of Single, then Multi. I hope there are Jet and Heli levels. I missed a Helilevel in BC2, that's why I never learned how to fly the damn things.
 
So I mainly use Singleplayer to get into gears.

" Wait...there's a single player? "

most likely i'll play single player first because that's just the kind of guy i am.

I usually go through single player first in games.

" @EpicSteve: So now the question is, which is a more ridiculous premise, this or Homefront?  Because first there's the idea of us still having a large enough contingent in Iraq by 2014. Then there's the idea of us fighting Iranians, which I don't think would happen, since the Iranian people actually really like Americans, in general. "

Don't care much for competitive multiplayer. Except in fighting games. And Worms.

Given the option, I like to play any sort of single player first.  I like to have a feel for the game before playing against other people.

Single player, but I think they're making it like all the other multiplayer based games with single players in it, where the single player is your tutorial for multiplayer. I really hate those games, but this looks kind of promising.

I'll play singleplayer just to get it over with, and then I will know if it was a waste of time or not.

If the singleplayer is actually good, I will be super excited. If it's bad (like BC2's) I will probably be upset at DICE and EA for wasting resources and not focusing on MP enough.

Also, China only likes N Korea because it acts as a buffer between S Korea and China. Also because they are commie buddies.

" Don't care much for competitive multiplayer. Except in fighting games. And Worms. "

I only touched the BC2 campain when the MP servers were down on day one, so unless that happens with BF3 I doubt I will even play the campain.

I always go singleplayer first.

left monitor, singleplayer 
right monitor, multiplayer 

I usually finish the singleplayer campaign first (unless it's a horrible campaign like Black Ops), but I'm buying the game for the multiplayer.

Mutliplayer. I haven't even started the BC 1 & 2 campaigns yet :/   Same goes for CoD, haven't completed a singleplayer campaign since CoD 2.