Its the night time where things fall apart. I've always like the games where ammo is provided and very limited. If you keep the ammo extremely limited at night, you can put objectives into place where players who dont have NV will stay in the action.
But if you have guys with NV with full ammo walking around, the balance is so out of wack its no wonder players lose interest.
athena 2 was so dark at night that I couldnt see my hand in front of my face, but game controll had missions all night, so regardless of the fact that most people didnt have NV, everybody was still engaged in the action because the hosts kept everyone busy with something to do...