i felt that DS is meant for LAN party & as such, single-player is very much dead. well relatively, if we compare it to DD or fallout series (ok, also BG series).
same feelings for NWN which nobody nor any reviewer raved about its single-player mode. it's for party & party rocks. stories usually go 2 hell when u play with friends unless u go for hardcore RPG(like D&D).
so i hope story/plot as well as side plots are stronger & with better ties 2 the main premise. example: if there is war looming, then have every NPC talk about war & rumours around it. the one like the travelling merchant whom u meet as u cross the bridge from aleroth who talks of war & that the orcs are coming your character dialogue allows u 2 either rectify him or aggravate the rumour by lying. now that's great for RPG.