i havent had a chance to really test it with more than 3 players, most of the time its fairly even, there are wide open areas but plenty of hidy holes and vents for aliens but who knows until its played with a atleast 4 vs 4,
one thing that will make it harder for marines though is that there are two ways into the hive (4 ways including vents) but one of the main ways (the shortest path)is blocked by a weldable door, and until marines weld that open (takes about 1 minute with one welder)they are stuck going the long way around in the long elevator.
I tried to come up with something about spawn camping marines spawn- youll notice the doorway behind the armour and left of the comm chair in the screen shot, all of the marines start behind the door and when they are ready to go out they hit the button and door opens, on that note, ive put in a push function so that aliens cannot get into that room, and the room is also sloped so marines wont be stomped if they stand a little further back, the marines can wait in there safetly for more marines to spawn if they like and go out as a group, ofcourse this leaves the comm chair vunerable.
spawn camping its not as big a problem for aliens, since its hard for marines to continuesly run into the hive, but i have put in enough spawn points to keep marines guessing and the hive is quite large to camp.
i have screenies and a download at this link http://home.iprimus.com.au/tomas82/