1. In my experience they mostly Attack. Since that's the key to win the campaign. (I also played mostly on the Ruskie Realism server)After playing a bit on the 40-1 Classic Multiplayer Campaign sever for a while I noticed a couple of things.
1. the winning team just votes to defend for the most part
2. the attacking team, given that only stock maps are run, are always at a disadvantage
3. the losing sides position becomes only worse and worse as they are forced to attack until man power runs out.
Also several times, on Pavlov's House and Red October, even though my team was slated to defend on the tactical screen, we ended up on the attacking anyways in game.
Maps like Red October, FF, and Commisar's House are still a pain to play on Classic as the attackers - basically resulting in a huge waste of manpower for any team unlucky enough to attack on those maps.
2. I don't agree with that.
3. That's the idea.