I played the games as well and I thought it was actually a good show. The vault experiment thing was covered, but in the show it was actually the rich elites that had presided over which vault ran what experiment as sort of a perk to investing in Vault-Tec. The insider attack was something the main character discovers in the final episode of the season and isn't the official narrative. The elites made sure they were put in cryogenic sleep in their special upper management vault before the bombs were dropped where they awaken one at a time to run things. It was an interesting twist and it could fit in with the canon Fallout universe.