cncb--
Interesting choice of comparisions. While the button text on MC is certainly the most aliased of the examples given, I think several things are at play here:
#1. You clearly don't mind blurry things, but find jaggies objectionable. The text for WMP "albums" "artist" and"playlists" is is overly smoothed by double, IMO, and the graphics for "beyond tv" are out of this world and on some other planet of blurry things.
#2. While the MC button text is the most jaggy, it is so by a near miss, which is attributable to the font choice, IMO. If you look at the text for "recorded shows" and "live tv" you will see similar jaggies, only SLIGHTLY less.
#3. The real improvement, IMO, is that "recorded shows" and "live tv" have drop shadows. That, along with the hi-con bg, makes that text the clear winner, all things considered.
I don't spend much time with theater view, but I thing a quick stab at a drop shadow for the text will do wonders for this.