I'm glad the difficulty slider is getting into the queue soon.
Thought should be put in to allowing an easy setting on it as well for those people who solo and can't do the standard level. Give a penalty to xp or whatever.
Personally I think I'd set it to easy only for mission where we die several times, and set it to hard for missions with stupidly easy factions (family/warriors). I definitely like the current setting when going in with a 2-person team. Hard, but doable and lots of fun.