Hosted a couple of games of TF2 MVM tonight. @danroundhill and a friend Brian joined and we had a blast. It gets hard but with a team of 6 communicating and playing our roles we could beat them.
I’m amazed that it wasn’t laggy (much) for people. The tips in this comment helped, particularly:
Step 4.5: If you didn’t set a password, when you load back in after the map change type “sv_visiblemaxplayers 6? into the console to avoid getting spammed with spectators that waste your precious upload bandwidth