Worthwhile only because it fixes the thematically fitting but experientially frustrating ending of the main game. Everything else here feels hastily cobbled together and disparate, as if Bethesda hadn't planned this content in advance but realized their decision to lock off exploring the Capitol Wasteland post-game was a dire one that needed a solution pronto without really considering what would best serve that experience. You need it to make Fallout 3 feel whole, but it's certainly not great standalone.