I'm talking about the GOTY addition "Broken Steel" which is part of my GOTY version of the game.
Originally i had the original version of Fallout 3, which imo was much more stable then the GOTY disc.
But this part of the Broken Steel add-on is extremely buggy for me, at one point i couldn't even walk 2 feet without the game locking up HARD.
http://fallout.wikia.com/wiki/Adams_Air_Force_Base
If you have the non GOTY edition i doubt you'll experience many problems, the occasional temporary freeze perhaps, but nothing really big.
its just the fucking air base in the GOTY thats buggy as hell.
Kinda sad that i can't really finish the game now (broken steel continued the original fallout 3 story)
but I'm at level 31 (goty raised the level cap) so most of the surviving was over anyway.