>>6 F1 and 2 had bugs, but they were hardly as annoying. Although F1 had one fatal bug when I first played it (Mariposa military base). Majority of other problems were about quests being fucked for one reason or another, but that's it.
Now F3 and FNV have problems with quests and more like a fine tendency to fuck up and die constantly or ruin all your save games. ALL YOUR GODDAMN SAVEGAMES OH GOD.
It's a fine tradition of all games Bethesda took part in, going all the way back to Daggerfall (infamously called Buggerfall) and Morrowind.
Also, Gamebryo is a horrible engine.
Mods still manage to make it look half decent though.