Over the course of the past several years, more and more of the video games we play have become increasingly connected — depending on a constant link to a steady internet connection in order for it to function. It's an understandable limitation for strictly online multiplayer titles, but aside from those, always-online DRM is a grating barrier to deal with for many.
For one, some sort of offline single-player option is important for game preservation; after all, a game's servers aren't going to remain online forever, and when they're eventually shut down, having such a mode means you can still enjoy the game you own. Without it, that title will never be playable again.
