I would just like to say how impressed I was with Vault 11. It is like a mini system/bioshock only better. From start to finish, creepy as hell.

Agreed. Stumbled upon vault 11 myself today and, even though the Shirley Jackson reference was quite obvious, I absolutely loved what I found at the bottom of it.

Currently Vault 11 is the only thing in the game that has stunned me. It was a thought provoking place.
I actually stopped for a few minutes at the final revelation, making me think, "Oh ____", just letting it all sink in to me.

Lol same here. It was amazing but sad to say, was the only amazing area that I've found that really got me into it and amazed.

Vault 11 is Black Isle/Obsidian at their best. No characters to talk to, just let the location tell the story.

@ The Enclave - Vault 19, whilst not as good as Vault 11 also has a good mood setting.

That vault really scared me at the end (!). Where is vault 19? I haven't checked that one out yet. I think the only other vault I've been in was Vault 22, which I also thought was fantastic and scary as hell lol. I think the vaults win in this one for me.

Vault 19 is just North East of the Great Kahn encampment. Go out of the Kahn's area using the mountain pass in the back and you will walk right past vault 19.