Windows Server 2016 updates take over an hour, unacceptable!
Updates in Server2012 and even Server2008 are much quicker and you at least get a gauge as to how long.
Not the useless 'Getting windows ready' + rotating dots, aaaarrggghhh!
And of course the fact that you can't schedule updates anymore so you have no idea when the server will reboot and take your services offline. Unacceptable. These bugs MUST be fixed so we can easily schedule update times and have them OBEYED.