Vault 3 and vault 21 are nice places with nice people in them! Okay, 21 is a concret filled hotel now and only has one resident and 3's population were massacred by fiends when they recently opened the door but it still counts!
Vault 21 has been turned into a tourist location/hotel, and vault 3 is filled with savage tribals who are possibly contemplating killing you with a laser, turning you into an ash-pile, and snorting you. It's always something with these vaults. the only vault that wasn't either a horror show, or falling apart was vault 112, and thats only because the people were being kept alive inside VR pods. Hardly normal.
I want to see something like Vault 21, mixed with like.. Megaton.
Civilized natives living out of a vault. Maybe a small megaton-like city around the entrance to the vault, and the Vault is where the higher-ups reside, but the vault door remains open. No creepy crawlies, no psycho malcontents, no freaks, mutants, or radiation, just good ole' human civilization, flourishing.
Psh, Too much to ask.