-----It's not that it was particularly bad story telling, although it did have some problems in logic. It really didn't sense that you had acquired a companion in Falkes who could perform the final task since he is imune to radiation, but then he cops out with some sort of destiny cliché.
The biggest complaint that most people have is that regardless of what one does in the last part of the main quest, it simply ends the game. I felt, like a lot of others, that it was a simply a big immersion killer to have to go back to a point prior to the end of the main quest, and simply ignore it if I wanted to continue to explore the wasteland and play out all the side quests.
They should have enabled the player to survive, so that after the epilogue, one could simply continue to play.