The game mainly failed on a technical level. The biggest promise they didn't deliver on was the optimization and stability of it all, meanwhile the community surrounding the project grew unrealistic expectations of what the game was meant to be, combined with a bias regarding CDPR. No videogame company is flawless, and the amount of hype generated around this game and the inability of people to judge it as a game and not "the holy grail of entertainment" caused a bigger mess out of it than it should have.