I've played through 6P, SRV, Judgement Day several times now multiplayer without any issues.
Playing on Medium resources, Morale Unsteady, with Disasters.
The beginning is pretty tough, but I enjoyed it. We spent the first 4 play throughs alternating who died because of forgetting to take a smelter with the group, running out of food because of traveling too far in evacuation, etc. (Could have kept playing, but we wanted everyone to survive initial evacuation).
Finally everyone made it through the initial evacuation. I ended up dying with around 175 of the 200 colonists. My daughter needed a lot of attention near the end when I needed to be frantically build blight resistant earthworks, so instead I sat idle while the blight assaulted my earthworks and eventually prevailed. Anyways, it would have been beatable if I had played a little better I think? Not sure about beating on low resources though with unsteady morale and disasters.
We played it as a non-combat map so the three of us could just each play against the blight, which worked well I thought. It would also work to slug it out some and then see if you still had the resources to escape I guess?
-Brett