Simply the best クソゲー I've played so far.
Dark Souls is the enemy of "aging", which is why I compare this game to a good wine (I don't have any knowledge about wine). The more sh*t it turns up, the better and more satisfactory it becomes.
I think it happens because of the good and fair things in the game that balance everything in a good way. Like the world, story, rpg elements, combat system, etc. Those things prevent Dark Souls from going into "bad old games" territory. And the game's proposal makes the bad things become part of the fun.