I didn't like the concept to be so overblown. There were a few brighter spots (in NV -- Valuts 11, 22, and 34), but overall the concept felt too tacked on as they did not have any point other than being the "yet another ride in the park".
22, 3, 21 and 34 did have their story reasons though, 11 is the weird one out IMO as while it's a great story, it is also a isolated story.
I don't think any Fallout in the future should have a vault unless there is a reason for having it there.
Like V34 and the Boomers.
Like V8 and Vault City.
Like V15 and Shady Sands, Khans, Vipers and Jackals.
Like V101 and the Lone Wanderer.