Dark Souls turned out a bit crap on PC, if you haven't been paying attention. As often happens in the case of beloved games with terrible ports, though, modders came to the rescue, unlocking the resolution, adding graphics options and effects, optimizing the HUD, and more.
While all of those examples are from a single mod suite (the venerable DSFix), there's a mod scene for the game burgeoning right now - burgeoning I say! Happily, it's easy to keep track of it all now, as a new Nexus site has been created for it -- hit the source to check out the goods.
Nexus, for the ignorant, is one of the driving forces behind modding in PC games these days, hosting hundreds of thousands of mods and plenty of resources for those into it, all for a variety of popular titles.