The system is only as complex as you make it to be... I am not a linux noob, however I basically was looking for the same thing that you were... a linux based media center.. nothing to do with microsoft... I started out about 2 years ago with myth.. more precisely knoppmyth... it worked for my purposes at the time, it allowed me to play media that I had stored on an external usb drive... it was kinda ugly.. nothing really elegant about it, but it worked for my purposes..
Since then, my needs and wants for a home media center have grown... my movie collection has grown tremendously, I have a fairly elaborate home network, a central nas for storing my movies, pictures and audio... and a fairly nice setup with regards to a flat screen and a/v receiver.... from knoppmyth I went to geexbox.. then to mythbuntu... again, it worked, but I wasn't happy with it... next I went to xbmc for linux... this was as close as I got to the type of UI that I wanted, but if you know anything about the xbmc port for linux, you know it's still very early and there is a lot to be done with it....
So after reading about lmce and watching the video, I knew that was what I was looking for... right now I'm not concerned with the home automation aspect, but after seeing what the system can do, I'm fairly confident I will be adding some of these features in the future...
I've had my problems with lmce installation.. but mostly out of my stubbornness with regards to trying to NOT follow instructions... NOT letting lmce be my dhcp server, NOT letting it be my firewall, NOT letting lmce install the way it was designed to.... well, after realizing that lmce works awesome the way it was designed... changing my home network and letting lmce be the core of the network... it works... it works really well.... there are still some kinks... I THINK most of these will be worked out with 7.10... some of the kinks are related to my hardware choices.... some are due to my media types....
LMCE can be complex.. but it can also be simple... just depends on how you approach it... I will tell you there is nothing else out there like it.... m$ crap doesn't even come close to what lmce can do... the first time I got UI2 working on my hybrid machine... had a movie playing from it on my flat screen, then netbooted a MD and played a DVD that was across the house in the hybrid... I knew I had found what I was looking for... I have high expectations of 7.10 (sorry Zaerc, hope I don't get dissapointed).. my only issues now are getting my remote control working and getting some media files recognized... the latter will definitely be fixed with 7.10.. I'm having issues with my graphics card... transparency is not working on my geforce 6150, so I'm having to use the medium UI... even if this doesn't get worked out with 7.10, I can definitely live without transparency...
LMCE is far ahead of anything out there...