I read a poll on another site (can't link) that had the question do you have an Xbox360? With the possible answers as 1. yes and it works fine 2. yes and it has tech issues 3. no not yet, and 4. no and I don't want one.
26% said yes, and it works fine, but 6.5% said yes, and it has tech issues. Add that up and it's 32.5% of the people polled as having an Xbox360, and of that percentage, 20% of them are defective. I know you can't take this as scientific fact, but even if it's anywhere close to this, then that's completely unacceptable. It's definitely not "a few isolated issues" like MS claims. Chances are if it was a few, those few wouldn't even have the means to complain on internet sites like they have been. Try a few thousand, MS.