I don't know. I prefer to see where all the budget went and appreciate all the details and love that went in the story of the game first. Also, I appreciate more the first time you use each weapon and gadgets in the game because if the game is developed well, they'll make you use them in suggestive ways so you can repeat the process in multiplayer after.
In the multiplayer, everything will be spoiled from the maps to the weapons selection. That kind of sucks, no? Your knowledge of the game will be very limited as well, and I doubt getting "owned" while trying to understand how the game plays is the perfect way to learn. You might even hate the game more because of that, and you probably wouldn't want to touch the campaign after a while.
But hey, I'm still posting here because I'm going to play the multiplayer as well... Just wayyy later!