So I'm going to put this in technical support in the hope it will garner some attention from Pulse.r and maybe lead to an eventual fix.
Space Marine suffers very badly from ping lag or latency related bugs at the moment.
1. No host migration where necessary. I've been in games where the host is the only obvious person not lagging or complaining about lag, and everyone else is on Red Ping. The game refuses to migrate. I don't have any screenshots of this, but its a terrible problem.
2. Games where everyone "appears" to have good ping, but everything is slow, with occasional "wait for host messages".
3. Game appears to freeze completely, in what I believe is waiting for host, still has sound, wait for host icon doesn't appear, then finally catches up. I normally find myself dead at the end of these bits, especially if I'm in a fight.
I don't have my hardware, but I am very much convinced it isn't the problem. I'll post a DxDiag. I believe have an Intel Core i7 920 slightly overclocked (stable + tested), 6GB RAM and an ATI Radeon HD 6950 2gb. Dawn of War and everything else runs great, and single player of Space Marine runs perfectly (leading me to believe it is multiplayer lag related). My internet is stable, and I'm able to play console games and other PC games fine.
Most games have an unacceptable amount of delay to them. Hit's not registering, or them registering later than they should, explosions hurting me when I'm far away, chainswords hitting me when I'm far away, people rubberbanding and jittering etc.
Not sure what other information I can provide in order to support this, or make it reproducable. Searching online about 2/5 games are unplayable, with 1/5 playable containing lag, and 2/5 being acceptable/fine.
EDIT: As Promised: hijackthis.log and DxDiag.txt