I use AirPlay, external monitors and projectors all the time. No problems here.
As we have to remind ourselves at work, hundreds of thousands of happy customers don't complain, but the hundred who do (quite rightly) are very loud.
In fact, to the contrary, it seems to have finally fixed my issue where Mail would randomly stop fetching new messages from Gmail until restarted. At least I haven't seen the symptoms of that in a while.
It going to take me months/years to trust Mail again. Such a horrible bug for them to release with.
My Air has had some weird won't-wake-up issues from time to time since 10.9.3 came out. Maybe its a laptop thing?
I honestly haven't seen a kernel panic in years though on any of my computers though. The last time I did it was because I had a slew of bad sectors on my HDD.
What I also realized was constantly upgrading from one version to another kept around some legacy files that messed up my OS a bit. A clean install might do the trick for those having issues.
Why is such a solution even acceptable? I had no issues before 10.9.3, but if I have to go through a clean install just to fix the issues, there's no way that Apple is going to keep me as their customer.
And you would rather that your $4000 machine kept crashing rather then spending 30 minutes doing something that could fix it?
I switched from Lenovo (which just worked without any problems) to Mac because I thought it's the same quality (it'll just work) with the bonus of allowing me to develop for iOS.
As it turns out, superficial things like the look and feel is better on the Mac, but it's nowhere near in terms of stability. I used my Lenovo for 3 years in work and at home as my only machine, whereas the Mac is in use for 1 day per week and I've already had more crashes on the Mac than I ever had on my old Lenovo.
I just don't have the time or the interest to babysit my laptop.
In fact, it seems to have finally fixed the sleep wake failures I was occasionally having on the Macbook Air since Mavericks came out.
I've had more issues with hardware reliability with Apple products than with software issues.