It's certainly the buggiest of all Bethesda (I know it's made by Obsidian) games. Well the original Oblivion was also extremely buggy at launch...
Whole quest lines were broken, I think I had 6 of them I couldn't finish. Thankfully the patches helped a bit.
Very fun game with some improvements from Fallout 3 but overall I think Fallout 3 is still way better and my Game of the Gen.







