The only downside is that a few things are ridiculously difficult when (in my opinion) they shouldn't be, for example setting up printers.
I don't think the average 'man in the street' could install FreeBSD as a Windows replacement, but then they couldn't administer Windows properly either.
I love the site, and I suspect the people who react badly to it are those that don't actually know as much about the platform as the author does.
Also, Anyone have a link to the thread were linus talks about the benchmark as a bug report?