My comment was too long so I posted it as a discussion.

Okay so in my opinion this is for the most part a really fun campaign aside from two main things:

The tank barricade event on CH4 spawns WAY too many common infected. If you're going to force a run to the saferoom after, at least give the players more pipe bombs or a bile jar. We had to reset that part so many times because it's literally impossible to push through there without at least 4 players and the map is so hard it's super easy to die. This is the longest chapter in the entire campaign and this event is simply too much for being right before the saferoom.

The finale is a complete crapshoot. You have to do a gauntlet and maybe multiple other hordes + a tank before you can even get to the finale area. Then, you have to fight off a total of 3 Hordes + 4 tanks + Fixing the four generators during the finale. I'm somewhat fine with this setup... but not when the lead up to the finale is so long.

I do think this campaign needs balancing adjustments for the difficulty, at least for CH6 and the event on CH4. You could probably also remove director tanks on CH4 because there's already a scripted tank fight but that's just my opinion.

This campaign was so close to being like a 8-9/10 campaign and these small issues made it like a 7 for me because it was so frustrating to play sometimes.