I get what you are going for. And I don't think it sounds bad.
But to me it appears more as something one encounters somewhere down the road (a maze to escape from while being sought for by an unknown... "being" one may not be able to kill -- a pretty obvious http://www.imdb.com/title/tt0078748/ reference) rather than begins the game with.
No doubt. I wouldn't be surprised if there were even further respecs like in Skyrim (the extra difficulty mode iirc resets your skills), because the player levels too much, too quickly and too easily.
To be fair the Vault 101 intro can be finished in 10 minutes if you know what you're doing like the temple of trials.But also like the temple of trials it can take a while to finish if it's a new player, so it's not an entirely fair comparison.