I have noticed the quality of Linux is not near the BSDs.
To provide you some more anecdotal evidence:
I have noticed that BSD lacks diversity and numerous solutions that Linux provides, which makes it far more useful than BSD in numerous circumstances.
It's a simple license, easily understood by anyone with a modicum of common sense.
The advertising clause actually is confusing when it comes to software implementations, particularly where headless software is used. Of course, you're likely referring to the newer BSD derived licenses, which place exceptions, but are not the BSD license.
The Free and OpenBSD boxes I've worked on and with have, short of HW failures, been almost perfect.I generally don't have a significant problem with Windows, Linux or BSD these days. OS X is another story though.