The honeymoon is over so time for some real impressions...
Gaming and core human nature just have a hard time mixing. Most people will shoot on sight because there is little reason not to. Not one is really dying or getting killed so we might as well do what is best for us which in most cases is to kill for loot even if the other person doesn't even have anything better than you. Main reason is because if the person with the better loot get spotted, he got a better chance at getting shot by the person with the lesser gear. It is a really vicious cycle that is only broken by pre-game grouping and planning. I seriously believe this game could be a really good case study on how people react when there is nothing to lose to do a bad thing.
With that said, it can get really tense at times because if you are alone, you want to remain alone. You don't want to attract anybody to yourself. So you think twice about shooting ANYTHING if you don't have a silent weapon. Now with the reverse of detecting other players, you will always be on a lookout since they can be anywhere and a surprise attack can end you in less than a second.
Unless you are really screwing around, this would not be a game to play to relax but it is a great game even with the bugs. Also if you have noticed, I barely mention the zombies. While they are deadly, they can be dealt with easily enough. Rocket may have said that zombies should not be the main focus but I think it may have been taken way too far. They should be dangerous enough that you really think twice about engaging them or even catching their attention. This would make the game more emergent since now players should be joining up more often than shooting at each other in game. Main reason I am saying this is that grouping up outside the game kind of break immersion and it really leave solo players in a rut. This mod is more interesting with other people but currently solo players who don't have outside connections are getting shafted. A post infection world should have the agressive last man on earth folks to friendly folks to those two in groups.
Hopefully AI fixes and improvements will iron out my issue above since I believe no play style should get shafted. Solo play should be possible but the world should encourage more group play.
Heh, mini review and critique from my phone...