The campaigns are unaffected, just the realism settings and control input were reverted to default.
I ran the not-mod but proper add-on
, did the first mission and just to see what happens with steam cloud, exited the game, restarted, restrated the first mission and my realism settings were reverted to default as was the control input, which of course is not a big deal, just reloaded my control settings.
Going to try and run the game now, didn't have a chance yet tonight, and let's see what happens with steam cloud disabled.