i've junked Media Centre, too unreliable and slow, it would be ok if it was not based on Windows 7.
Had too many network glitches with 7, booted it up one day, refused to connect to any sites, could ping them fine! Would it web browse? Nooo. My Mac could web browse fine, so could my iPhone, next day Win7 box worked fine! It would randomly drop net work connections too, got pissed off with too many random bugs so junked it.
Now use app on my Mac called Magestic which shares some folders & my external media drives, it links to the xbox, just browse the videos section, job done. Don't have to fart around loading/using MCE.
MCE took an age to index some of the bigger folders too, with Magestic its instant!
You either have hardware issues, or lack the ability to properly set up a PC

. I have seen weird network issues under Windows 7 when those illegal loaders are used.
I have found Vista and Win7 Media Centers very reliable, only issue I have suffered was a duff updated Intel audio driver (Rolled back, problem solved).
I should say, with all MCEs, it works better if its a dedicated unit, and doesn't have all the normal trash that you stick on a desktop. Additionally, and this is where everybody with a lonely brain cell go badly wrong, never, ever, ever use those useless bloody gay codec packs such as K-Lite and its ilk. Sure way to bugger up any PC, esp PC's who's primary role is playing media!
The only additional codec needed on a Win7 Media Center is FFDShow, and thats more for AC3 than video. If you want to play HD rips, often in MKV format, then a splitter for that as well. Nothing else. Especially stupid gay codec packs put together by gay idiots like K-Lite.
I believe my MCE reboots early hours of thursday morning following black Tuesday (MS's monthly patch release date). It only gets additional reboots under special circumstances - eg, the other day, AVG was being isistent about an upgrade.
As to using a crappy mini Mac as a media center, thats a bit of a joke, as the choice of tuners is minimal - ability to receive TV and radio broadcasts is pretty important

. And Majestic, thats not a Media Center, its little more than a fileserver

And, as I sit and type this, I'm watching Ronin via the MCE's DVD drive, she's in the kitchen streaming one of her programmes (Downtown Abbey, or some such crap) via the Xbox, and if Top Gear is on Dave, it'll be busy recording them
