Okay, so what are we saying here RacerX? Everyone should know not to update their software even when their computer is set by default to update their software? Every new Mac user should have an expert they can call or talk to about their computer and if no expert is available, spend time scouring the web for information on running their computer because their computer company can't supply them with enough detailed and clear information? For those without the expertise or someone like you to call, what happens to those who pay Apple for support and call them? You know what Apple says (at least to my new user friends who followed this path)? "Run the updates!" Most people would assume that Apple would be the best for having the most competent experts on the Mac, so why do they pump out and/or recommend these updates if nobody should run them? (note, apple tech support is often inconsistent - you can get a sharp or dull cookie depending on your luck, but where is that published?).
What about security? Many OS X updates include security updates - it often says this right in the update notice text. With all the hype in the media about computer security (though thankfully on the MS side of the fence), isn't it reasonable for a new Mac user to think they may need to run an update at least for security purposes?
There is no logic here, no clear message or source of expertise - especially for new Mac users who buy into Apple's marketing message: "Easy to use, less hassle, reliable, dependable..."
Maybe my expertise at software is above average but still quite limited, but I am a user not a network admin. I use my computers very productively for my work. As a user I am way above average. You know, some of use computers for work, not just making computers reliable and stable. There is more to life and business than keeping a print server up. I make the money my IT department blows on fixing problems.
Business, education, healthcare... is sick and tired of buggy IT and all the excuses - it is a drain on everything is NOT the center of interest or priorities. Though Apple is far superior to MS or anyone else on this, but the same old IT arguments are getting very old and tired. I hear network admins going on and on about their issues as if the network was the whole purpose for the business or institution existing - not the other way around (eg. reality). I often quote Alan Shepard (from The Right Stuff). "Fix your little problem and light this candle." Sure maybe we could all spend time learning more about technology, but network people could sure use a lesson in learning more about business and users. RacerX you sound way way above average in your job, but you are rare. Your profession needs more people like you!
When OS X first came out, it was very much a work in progress. Updates were common and often resulted in substantial benefits in performance and features. From this, I found myself excited at OS X updates. I ran them from 10.1 and was rewarded with a much better computer every time. Apparently I was lulled into a feeling of safety by so many effective updates. I have learned the hard way. Now, I don't run updates and I tell the Mac users (all 600 miles away) who I convinced to buy a Mac to not run their updates either. Even with these issues, there is no way MS updates for security are any comparison - the instructions and steps for required security updates are a nightmare and very risky and confound non-savvy users all over the world. No argument here - Apple leads the way on updates.
Now for my machine, I do run many third party OS hacks - many of which I find increase my enjoyment and productivity in using my computer (Fruit Menu, Virtual Desktop and a few more) so I realize their is a risk when running an update - most times there is not. I know Apple can't account for this stuff that messes with the OS so I back up my entire drive to another drive using Carbon Copy Cloner and I am safe. If there are problems I can just switch to the other drive.
My two "switchers" have Emacs and iMacs with nothing other than maybe MS office on them and they ran updates and had big problems. One lost the ability to run iMovie 3 (her sole purpose for buying the Mac in the first place) and then paid the Apple support fee only to have Apple not be able to solve their problem - after being guided through reinstalls she still can't run iMovie 3, Apple can't give her iMovie 2 and told her, swear to God, to just wait for 10.3. I suppose she could shell out a few hundred for FCP and then spend a few days learning how to use it, but she was sold by Apple commercials and Apple store reps on the virtues of iMovie and iPhoto (which often locks up).
I'm not clear on the whole story because I was called after it all occured, but I believe she updated her OS because the update of iMovie 3 required and update of Quicktime which in turn required an update of OS X. She foolishly thought iMovie 3 would give her more features (after all that was what Apple said in emails, their website and update notices) and that the upgrade path would be safe given she had virtually no third party software on this Mac. I suppose she should have called MIT and registered for a class in OS architecture prior to running all of this? So, this wasn't a case of it aint broke so don't fix it, it was a case of Apple saying here is a great new product that is unique to your Mac (iMovie 3) - run all the updates and have a great time with those family videos! Search this site and you will see many people with update issues including iMovie 3.