I love that this game has modding support for Xbox. This makes the replayability literally limitless. I can come up with so many mod lists, it's like creating a new game every time.
As for the original game:
Graphics ๐๐๐๐๐
ย ย ย ย ย ย ย ย ย For the time it was made, the graphics are amazing.
Story ๐๐๐๐
ย ย ย ย ย ย ย ย This is only in comparison to other fallout games I've played. So far, FO3 is still the best story I've experienced in the franchise.
Immersion ๐๐๐๐๐
ย ย ย ย ย ย ย ย ย I mean Bethesda has pretty much nailed this aspect going back generations for both Fallout and Elder Scrolls.