I think I read somewhere here that the lack of information about the story, unknowing whats coming next, and the 'mystery' factors in KF / ST actually contributed to the intrigue and interest of the game, and it makes sense.
If you know exactly whats going on in a game, it takes alot of the challenge out of it - and discovering it yourself first time through makes it feel more personal, because you take it all at your own pace.
Personally I think that Demons souls is alot closer to ST than Dark, and when you consider that it was released after STA:A its safe to assume alot of ST elements are built in, like the soul levelling is probably a revised idea from the soul pod. Though the 'mothball' idea that Demons souls was born of is probably a combination of KF and ST.
I can only hope that From return to do an amazing first person game someday - the problem is, if you had a first person control in the souls games, it would be very disorientating when you attack, and even simple actions like writing a soapstone message where the character bends down could induce dizzyness.