I reject the premise that a set of greens must necessarily have a lot of internal movement in order to be eligible to be considered "great." I think the pursuit of "great" greens has caused some excesses. I'm coming around to the view that some of the hysterical greens that have been built in recent years are rather far from great, though some are, for sure. I don't associate Pete Dye with wild green contours; many of his courses are excellent not because the greens are wild, but because they fit perfectly with the other design elements. I feel similarly about the links courses whose greens aren't heavily contoured.
So to me, RCD's greens aren't what makes it slightly overrated; as others have suggested, if the greens had more going on, the course would cross the line between challenging and abusive. My take on RCD is that the course suffers a bit of a drop in quality between the incredible/world-class first 13 holes and the last five. It's not that those last five holes are bad (although 16 doesn't quite fit aesthetically; it's clearly a new and new-looking hole still), but it's more that the first baker's dozen are, IMO, sublime. The last act is a bit of a letdown, where Portrush,
which I also give a slight edge over RCD, establishes a high level and finishes at a very high level. Calamity Corner needs no introduction and 17 is an incredible golf hole in its own right. RCD's 18th is probably the most disappointing hole because after a bunch of strategically interesting golf, it's a pure execution test: hit it straight, then hit it straight again.