Perhaps you should try Bloodborne. Combat (and by extension movement) is faster and more agressive... and while there are definetly some narrow corridor areas, I would say they are generaly more open than in Dark Souls. Story is similarly vague, but I think it's easier to have a general grasp of what's going and what are you doing (although you definetly need to talk to NPCs, read items descriptions and such to get a better idea). And even if you don't really know what's going on... like on NPC will tell you, you shouldn't worry too much about it. At least at first. Oh, and while there are some RPG elements involved in your physical condition and your weapons (and they are worth understanding and playing with in order to get better at the game and have more options), they are not nearly as important as in Dark Souls.
Of course, Bloodborne is still a difficult game, there are some unfair situations and you will still die a lot. But I believe most of your complains with Dark Souls will either disappear or be somewhat reduced in Bloodborne.
