RPG means Role Playing Game.
And Dark Souls has you playing the role of an undead walking his way into godhood, and choosing whether you'll sacrifice yourself and continue the age of the gods or you'll begin the age of man as the Dark Lord you were destined to be... more important choices than you'll ever find in Skyrim, ijs...
And get it in your mind ppl, RPG stands for Role Playing game, but it doesn't MEAN roleplaying game. Not any more than Adventure game means a game that has the character embark on an adventure - both genres in fact have the same exact thing - you playing the role of a character embarking on an adventure.
Get it in your thick heads already that "RPG" and "Adventure" do NOT refer to the way the story unfolds, but in the gameplay... Howe many times must it be said before you get it already? Just look at what games are regarded as RPGs by gaming sites dammit =_=