Microsoft has put a lot of energy in to this and a lot of developers worked hard to make this happen. Same with Vista and IE. The quality of these software are not up to the mark for something that comes out of Microsoft. I expect great quality software from great developers. Nothing less. I know very well how complex the these systems are and I can imagine how passionate those developers are about their product.
Most of the times people who complain are ones who cannot get anything right. Some people try again and get things right and stop complaining. Some people give up after one try.
I get some errors running the sample application from the Game Studio whereas my friend did not get any problem. As a programmer I have to troubleshoot and find out what the problem is. The documentation does not have any details on what the problem is. Try googling NoRendererException. At this point the only thing I know is that it is coming from Audio engine. Audio is working perfectly on my machine.