Dark Souls was probably my favorite overall, the bosses were memorable and the inter-connected world was a joy to traverse through. It really felt like I was on this grand adventure going through a dying world. Demon's Souls is my second favorite, I think it had the best atmosphere in the series. Dark Souls II, while I love it, doesn't feel as innovative as the last two games. It's kind of treading it's wheels at this point. I also hate how levels are so random now, nothing feels connected anymore. It just kind of feels video-gamey and not quite as immersive.
Sigs are dumb. And so are you!