I realize that (although I didn't know that it was they who standardized it until after I was doing some initial research on the .NET underpinnings). The overall thrust was, are their certifications really worth much of anything?
I'm not sure. My guess is that ECMA isn't worth nearly as much as ISO, since even Microsoft stepped up to ISO certification with C# after it was already ECMA, and they're trying now with OOXML. ECMA seems to act as a springboard to ISO certification.
That ECMA is a rubber stamp may be going too far, as Sun withdrew Java from ECMA standards a while back because it would lose total control over it.