[After a brisk nap]

Yes, in my experience adventure games are far less buggy than other genres. I don't think I've played a single RPG that wasn't bug-infested, for example. (Daggerfall still reigns supreme as the buggiest piece of crap I've ever had the misfortune to try to play.)

And while of course all bugs are ultimately programming errors, I'd be far more inclined to blame poor management and software engineering. It's simply impossible to write something as big as a computer game without making mistakes. It's the responsibility of the system architects and the producer to make sure that the errors are found and can be fixed. And then of course it's the pressure to get the game ready for release in less time than it takes to make and test thoroughly.