There aren't really any other modern games comparable to Dark Souls. Dark Souls is like an NES game brought into the modern era, and is the complete opposite of what other games are trying to be. The games that most closely resemble Dark Souls in terms of game design are the classic titles such as Megaman, Metroid, Ninja Gaiden, and Castlevania. But I don't think those are the type of game you're looking for.