Yes It is not what you see in a propper Bethesda RPG right? (Oblivion, Morrowind).
It's not a Bethesda RPG.
What is wrong with the Fallout series??
Bethesda's bad writing, with Gamebryo as a close second.
Fallout 3 is much more enjoyable with Broken Steel.
Oh is it?
I found it to break the game and not be worth the trouble.
I also had a bad experience with this when I played my first RPG ever (Bethesda made!) the Pirates of the Caribbean cause this was not allowing post ending play too! Nice idea with the DLCs...
If you have a problem with an RPG ending then save over a dozen or more savefiles regularly and when the game ends you just reload it.