DLC that is just cosmetic, or DLC storylines that take nothing from the base game are fine by me. I can buy them or not as I choose, and they have no effect on the actual single player game play. It's only when they add DLC that changes the way the base game plays that I start to have problems. By all means, add multiplayer skins and the like, if you can make a buck off of it, more power to you.