I just picked it up about a month ago and have been slowly making my way through it. I'm still in the Undead Parish and fighting the winged gargoyle boss on top of a rooftop. I can definitely see the appeal of this type of game. Been thinking of picking up Dark Souls 2 when it comes out even if I don't get around to beating the first one.
I'm liking it. As a mostly Recon player, it's nice that that class now has the ability to take on a tank or jeep with C4. Also, Zeroing is a neat mechanic that takes some getting used too. Playing on the 360, it looks and feels a little janky at times but, still liking my experiences with it.