How crucial is it to follow the story line?

[darkely]

Is it that crucial for me to play the games in order? I have been playing Penumbra: Overture - keep in my mind I have already beaten Amnesia: The Dark Descent. So I was used to the amazing atmosphere but now a lot of the improvements are gone due to the fact Amnesia is newer :'( but don't get me wrong it is still a good game (aside from the seemingly invincible dogs...). The order to my knowledge is Overture, Black Plague, and then Requiem I am a big fan of story lines but I do not like Penumbra: Overture that much others have told me that Black Plague made some huge improvements. So should I skip Overture?