Started watching it right on the release day. Great production values, some solid characters and decent development of storylines imo, but the overarching plot, "the hero's journey" fails to build on momentum when the head of certain scientist character in the series is taken although the ideas with experimentation involving mutation and gulpers were promising. I think "Fallout" had ambition of being the next "Walking Dead", but it lacks the realism and complexity of more immediate threats to the characters, such as ones in Ep. 2 featuring Dale Dickey's Ma June character.
In terms of plot and intrigue the final episode ruins a lot of what had been built over the course of Season One there, but I'm saying this as someone who hadn't been playing the videogame itself.