Re: Hypocritical
I'd think the overhead of FUSE would outweigh that, in the ZFS case, but I've never benchmarked it -- maybe FUSE is more efficient than I would think.
FreeBSD's stack is highly consistent and stable, but you're right, my experience is it's not quite as fast. This may partly be interface-dependent, though -- FreeBSD's driver support is not as comprehensive as Linux's.
As a sysadmin I really like FreeBSD, everything is straightforward and easy to maintain. It has a nice, clean init system, multiple good options for handling package updates, and I've never had a failed upgrade between releases. (RedHat, on the other hand, requires you to reinstall to upgrade.)