the res they stated is 720p which is just fine for macbooks and okay for MBPs.
considering that more & more macs being sold are laptops, that's not bad. you can still hook your laptop to your tv and use it as a traditional games console.
it's not meant for high-end pc gamers with $2000-$3000 rigs. you still have the option to buy discs or downloaded content
You can build a 1000 dollar PC right now that makes games run great at 1920x1200. For 300 more a 24" monitor that does 1920x1200.
It's a myth it takes 2000-3000 to run PC games at high res. Honestly you can build one even a bit cheaper than I stated that still screams in comparison.
1920x1200 on a 20mb cable modem connection playing a FPS with a 20ms ping will make playing at 720p with lag look like crap in comparison.
They tested this in a lab setting and many reviewers and attendees stated they could notice the compression , check out Shacknews , they stated it was very noticeable.
I just say that my guess is this won't be near as popular as they are making it out to be , as the slightest problems people have in their connection will be amplified x1000 having to actually pull the video content also. Add on to the fact that a cheap PC at the time will be able to run at twice the res and faster and it really won't have much of a point to it.