I work with computers all day long. I don't want to sit at home in front of a computer to do my TV viewing. This development was something that you guys placed some greater importance over. For most of the common people they would rather have MRV from DVR to receiver/DVR.
Media Center and MCX do not require you watch TV from your PC. I have a dual-tuner, HD OTA Media Center setup in my house with 3 extenders and the PC is in my basement with no monitor, keyboard or mouse connected.
You watch TV from the set top box, XBOX360, or even some TVs now have the MCX software built in.
Simply put, Micorsoft has had MRV for about 5 or 6 years now (even before ReplayTV) with this setup, some of us have large investments in Media Center as a Recorded/Live TV solution and now we'd like to get DIRECTVHD content in there as well.
If you've never used the Media Center interface, you won't understand how EVERY other interface is behind, and while it does have it's problems, keep in mind that for the last 5 years we have had Photos, Music, Video, DVDs, Recorded TV, Live TV and Internet TV, HDTV in a single, amazingly elegant and usable interface while all other solutions have only ever offered a subset.