I received mine yesterday and just unpacked it to check and i'd say you are right! The modifiers are pretty far off the grayish tone on the renders. Your picture compared to what i have on hand looks a bit oversaturated but if you compare alphas & mods it gives a pretty accurate view on how they compare to each other.
Edit: I just looked at the Pantone Colour Chips that have been posted at the end of the OP, it's pretty accurate to what i received. Renders are a bit misleading tho they are just renders. IMO it looks quite nice but a lighter tone for the mods would have made it pop more.
True, they do indeed look quite close to those Pantone color examples. I didn't pay much attention to them earlier, just looked at the renders. And the renders seem to have a lot more contrast between the alphas & mods, which I feel would have looked better.
Not saying it's bad either, but agree with the missing "pop factor"
Especially in slightly lower light it just looks like a quite uniformly dark set.