I've had my 360 for four years and never had any problems besides occasional overheating, which is fixed by keeping a fan blowing on the console or restarting it when it does happen. Yes, I play it for hours and hours non-stop at a time and the overheating is still rare. I don't know why all you guys had/are having issues with consoles breaking.
You're the exception to the rule. There is no debate that there were design flaws with the xbox 360. The repair policy for the RROD is proof enough of this. The fact that you haven't received it yet means you're lucky. It doesn't mean that the flaw never existed.