The thing I minded the most about Fallout games was the bugs,bugs usually caused because the BIS had to rush to finish it.
Fallout 2 in particular had several crash issues,quests that wouldn't even start,NPCs doing strange things like throwing grenades at themselves even the damn endings were bugged.
(Also I find it sort of funny that only the good/canon endings are bugged)
Thankfully fan made patches wiped off most of the crap on the gem that is Fallout.