Seems like the only thing that causes them anymore is a bad driver, and those seem to be quite seldom to come across. I've actually had two in 7, some type of memory overflow, but I blame the cheap Gateway I purchased.
If you think about it, there's no particular incentive to make it rock solid. Most Boot Camp users use Windows as an adjunct OS to do something that they ironically spend most of their time in and is the bulk of their actual work, and then retire to what they think is the better OS to do 'cooler stuff'.
You're for example one of the few people who would correctly attribute the issues to Apple or their driver devs, and not Microsoft - the vast majority of Boot Camp users would roll their eyes and curse Microsoft at the latest BSOD. It's a form of very effective negative reinforcement on the part of Apple - and I'm not sure whether they're that amazingly good (I'm personally inclined to doubt it) at even the slightest detail of their product marketing to actually do this intentionally. It works well enough for there to seem to be not a particular problem with the installation, while being just unstable enough to bring the quality of Windows into question.
But intentional or not, it has what could be termed a desired effect for Apple while not in most cases bringing disrepute on *them*.