I just played a round Sudden Death Blitz with a friend and it's awesome fun! Like 100 times better than playing alone! So why haven't we tried that earlier already? We did. But we both don't show up in the server browser when we host. However, I was able to join my friends game through the Steam overlay. My recommendation: Send an invite or click on the link that Steam pops up in chat when you want to play. Give it a try! MNC froze the first time I tried to join but it worked after I restarted and joined via Steam link again. Might have been a problem on my end though the first time, not sure. So don't give up!
I now wish to add you as a friend as endless crossfire matches both ends are just getting tiresome. Been checking the blitz servers to see if anything poped up, but of course not, apparently that's still not really fixed per say.