Dark Souls is still completely worth it, AS LONG AS you install DSfix. Dsfix is pretty much required, but contrary to what photon said, it's actually quite easy to install. The game itself is one of my favorites, along with Dark Souls 2 and Far Cry 3.
It's also worth noting that you can play them in either order without missing much since they're set centuries apart, but I think you should start with Dark Souls 1 as it introduces several characters and events that are hinted at in easter eggs and inside jokes in Dark Souls 2.