We ran it with 4 guys tonight, two tries. It is coming along well, but a few major hangups.
The biggest was a freeze as we approached the airports. I hosted the first, a friend hosted the second. The lockup/screen freeze came as we got near the grey box (on the map) SE of the airfield. I was AFK when it froze the first time, but the second time we found that a couple of us froze first, a couple continued to live in-game for 30s-1min before noticing moon-walking characters and the inevitable red-chain/server communication error. The only consistent part of the freeze was several characters approaching the airport. The first time, I had died in lopatino after we earned the airport objective, and I was able to respawn at the airfield and engage enemies (dying/respawning several times). The other players had already received the audio and air support options. This did not happen the second time.
Other tidbits:
On the MP setup screen, the names 'Igor' and 'Dimitiri' are all-caps. The other names are first-cap, rest lowercase.
The first conversation about the tractor and associated cutscene started only 10-15s into the game, and the second conversation/cutscene at Yuri's house also started and scrolled too quickly.
The white pickup blew up without passengers in the first run, next to Yuri's house. No other explosions/tank rounds fell nearby (if that's what it was).
After the narration text in top-right about Russians moving toward the airport, a second appears that reads 'blabla'
I'm very happy with the town difficulty now, and I can live with that many enemies still alive in Lopatino. To help players handle leaving that many behind, the storyline/Igor's subtitles should clearly emphasize the need to leave a battle and rush to the airfield. I'll have a look at the stringtable. It might be fine as-is.
Ah-reminds me. The stringtable file has nothing in its title to associate it with the mission. It doesn't cause problems presently, but my MP folder is getting crowded, and keeping the naming convention in place for both associated files would help.
I don't have any comments about assaulting the airfield, since we didn't really get to it.
Great work! Everyone who played it at sparta said it's a fun mission (up to the freezing part).