Note: I am not suggesting that anything be changed right now for NS2, as what I'm talking about would be a very significant change and now is probably not the time for it.
It slightly saddens me to hear that the maps in NS2 will be smaller - instead of sprawling corridors and such, it'll be 6-8 distinct rooms. I think a great part of NS1 is the ability, for individual players, to pick their battles. Marines can choose to be with their squad taking down nodes or trying to siege down a hive, or a marine can be walking around by himself attempting to ambush a retreating lifeform or sneak a PG in the hive. Aliens can, too, be all working together to kill the main marine group - but one fade can be harassing MS, or skulks ambushing lone marines in completely unexpected places, etc.
So, there isn't much point to this thread, except to point out that I like that NS1 has large maps which allow for a variety of play styles.