1. The User Manual is horribly generalized, and provides no detailed information on may of the features. This left me to pretty much experiment with trial and error to get things to work.
2. The system is too damn complicated. If you are just trying to setup a standalone media center on a network, your in for a heck of a time trying to get it to work. Perhaps during the installation process it might be a good idea to allow users to configure the media center as a purely standalone machine running on a network. Both the DHCP Server and the Firewall would not be needed in this case.
3. If I do not have any Lighting, Climent Control, VoIP or Security System why does it appear on the home menu?
4. I am not sure why but I could only get MythTV and Firefox to work about 50% of the time on my first install and not at all on my second install. Very difficult to get the system to work when you can not get to the administration interface.
I hope that some of these suggestions help, and in the future I can come back to LinuxMCE.