I care lol, I love NWN. I'll most likely get this game, the overland map exploring sounds a lot better than the old way of travel. Screenshots look cool.
I think the 10/20/100 etc. are just megabits per second modes it supports. I think 100mbps is plenty for LAN. The more the better if u need to transfer large patches or whatever when youre all set up tho. But the network controller in most computers can handle like 1000mbps tops if its a newer comp. I'd just get a good brand hub like linksys.