First of all I want to say that I am a huge AMD fan. My only problem with Intel is price to performance ratio.
In the cause of the SLI systems that are having problems, are they being built with suitable power supplies? Could the problem be related to other factors other than the mobo chipset? Were the system designed properly. I do need to point out that I have not yet built one of these systems.
On the subject of nForce2 chipset boards, I did have lots of problem with RAM when build these systems, but the problem seems to have gone away since switching to a new RAM vendor.
I've also talked to other computer stores in the area about the problems I've had with the nForce2 chipset and they seem to have no idea what I'm talking about.
Isn't it possible that the people having problems are not using the best components in their systems? Maybe the problem is with motherboard vendor's implementation and not the fault of the 3rd party chipset maker. The quality and stability of the motherboard is just as important as the chipset. Even good vendors put out a piece of crap from time to time. I prefer Abit or Gigabyte motherboard, but still consider ASUS motherboards to be high quality.