I've had pretty good experiences with "Killing Floor". Reasonable co-op is possible and most people are only communicating via hot keys ("Get to the trader!", "Need money.").
nille replied to MrHoatzin's topic in Video Gaming
"Airships"
By: David Stark (Zarkonnen)
Available: http://zarkonnen.com/airships/
Synopsis: Construct your own blocky airships, stuff them with all kinds of explosive weaponry and watch them light up like a Zeppelin. You're able to fight multiplayer matches via the internet. And you can order custom heraldry. Don't tell Jake.