It's pretty neat that the Xbox One picks up network tuners (HD Homerun). All they need to do is integrate them into the OneGuide and they would have a great system. I would buy a couple of HD Homerun tuners if they did that. Also, if they dressed up the Media Player app to be more like Plex or XBMC with background art, descriptions, etc., I would never have to open up WMC except to schedule a recording.
In fact, with universal apps, there's nothing stopping the community (XBMC, Media Portal, Plex, etc.) from writing the apps themselves. All the tech is right there largely unused.