That's not what Media Center is for. Unlike Apple's Front Row, Media Center is meant for watching live TV and recording TV as a DVR.
I have an HDHomeRun Prime triple tuner with a cablecard. Media Center is on all day long. It's a much better interface and DVR than the Scientific Atlanta cable boxes my cableco uses. Also, my recording capacity is much higher.
Same here. The removal (or, pay a bunch to add it back in) of media center makes me sad. Not because I won't be able to use my setup, (I can still stay with 7), but just that with microsoft dropping support, its going to be a dead industry. Add onto that the terrible opposition the cable industry has to cablecards and I think the DIY DVR doesn't have much of a future.
I guess if everything does move to a streaming format that might make things simpler, but I still liked holding the 'roll my own DVR' card when playing with the cable companies.