Quoted from InfiniteLives:
The way these games map takes you really far away from the center node only to unlock short cuts and what not back is really great. The environments are just fantastic.
I think Dark Souls did this the best.
Demons Souls didn't really do this since it was based on teleporting into a zone from the Nexus.
Dark Souls 2 had a pretty bad cross shaped map with dead ends, if I recall correcty. I didn't like that about it at all.
DS3 had some of the connectedness, but I don't think it did it as well as DS1. Maybe by the time I got to this game, I was a decent player, but I found DS3 to be way easy, and it got easier on NG+...
Bloodborne is the best of the Souls games, in my opinion, though you're forced into an aggressive play style over the potentially slower defensive style in DS.
I guess if I had to rank them:
Bloodborne - best atmosphere and "story"
Dark Souls - awesome connected world - interesting "story"
Demons Souls - started it all - great concept and level design - you can become the boss for a level in another player's game!
DS3 - a nice layer of polish and a good implementation of the formula, but it kind of felt like a rehash - I honestly didn't come away with incredibly memorable experiences compared to those above.
DS2 - I don't know WTF was supposed to be going on in the "story" of this one. I was happy to have a new entry in the series, but I found myself wishing I was just playing the original
Anyway, Dark Souls on Switch should be a fun way to experience this awesome game. I would recommend giving it a try to anyone on the fence. Play it online, and know that you will be able to overcome obstacles, even if they seem impossible, especially if you summon other players to help you.
Oh and forget about anything you have in mind for what playing an online game today is. I hate online games, and I'll probably subscribe to Nintendo's service to play DS.