Sounds about right to me. It's either a very (trivially?) simple system, or one they (designers/manufacturer) really know how to handle EMC, that passes first try. My own record is, maybe, oh, 30%? Depending on how you count it. EMC is a complex topic, and clients want all manner of ridiculous arrangements (one I worked on, they wanted USB carried on unshielded cables! And expected it to pass 10V/m radiated and 2kV EFT!), few of which are designed in such a way that they are tractable. Complex cable harnesses and lack of ground planes are prime warning signs.
Tim