It's definitely a port
Let's get this out of the way right now: Dark Souls: Prepare to Die Edition is pretty much a straight port of the console game. It's clear that From Software and Namco Bandai—admittedly unfamiliar with PC development—didn't put much effort into appeasing hardcore PC gamers with pages and pages of platform-specific options.
So if you're looking to change your FOV, crank up the graphics and effects, or otherwise optimize Dark Souls for your $2,000 gaming rig, you're going to be disappointed. It looks like a console game, because it is a console game.