Well the ending can't be worse for the pc than Fallout. You saved the vault without hurting anyone living in the vault(unless you killed them, ah S.P.E.C.I.A.L. was so damn good) and they throw you out as thanks
I have read some spoilers and i don't think he is 30 minutes in the game. I won't say anything more, but you dodn't have to get a refund when you buy the game