Who cares about shutdown/reboot times? I see your point but I definitely care about it - this is unique to 10.8.2 and really painful for SSD and many Retina users users who were spoiled by short shutdown times in previous releases. My laptop is SSD and portable, thus it gets moved several times a day, has external disks attached, and gets plugged into different hardware every time. You either have to take a lot of time to deal with the hardware each time or just ask the machine to shut down....which is a lot easier if the OS is behaving itself.
HDD users probably do not notice it, since it only adds incrementally to a rather lengthy shutdown time. I'm hoping it's fixed in this release and I am not going to re-install ML until it is. That being said, Lion is "only" adequate but I'd prefer ML if this issue can be resolved. I know this release is taking a long time and many folks have other more urgent issues they want fixed and to install the release, but I think (hope) that the wait will be worth it.