I voted.
I'm a single player.
"BeachAV8R", a reviewer on mudspike.com says: "For those people that are predominantly offline players of DCS World, the tutorials, single missions, and campaigns ... are essential to deriving the most from each purchase".
I fully agree.
Jabbers_, why are you trying to gain some insight? Are you working on a campaign or a project? ;)
Please share with us.