I played the first two games back in the days, and I must admit I don't remember well the lore of Fallout.
I start Fallout 3 only some months ago, but I didn't get the vibe I remember from the 2 first games.
I can't really put my finger on it, but I found it less fun than the 1 & 2.
I think the 3 lack the twisted humor of the 2 firsts that I enjoyed so much. Probably due to the fact that it's now Bethesda which owns the franchise.
Anyway, unlike you, I enjoyed the show.
Perhaps it don't totally follow the lore of the games, but I think it's still a good SF/post-apocalypse show.
And now, I'm going run to the shelter of my vault before being struck by the fallout of the sarcastic comments of our resident little ginger devil.