Any tips for a coop newb? What to do, what not to do? A common sense what's what?
Just played my first round of coop today, because I wasn't able to open an own game - due to the European Battlenet choking on Sunday traffic (they're down and out now). It went quite well. Didn't speak a word though. No 'Hi there!' or anything. I guess that's where I went wrong to begin with.
Naturally I looted all the craploot, as per usual - and naturally, I had a full bag after a while and went to sell my crap and repair my gear. Of course that's when the other dude left without a comment thereafter. So the first social lessons learned when PUG-ing Diablo III, don't loot crap and at least say 'Hi!' and 'Full bag - going to sell my shit!'.
Also - there's emotes on the num block. Do pick up group people register and respect those in coop play??