"What’s special about it?"
John C-S:
There are a number of things really special about #10 Riviera.
In a sense that hole just may be considered perhaps THE text book example of what really good "man-made" golf architecture can be at its very best.
The reason I say that is because that hole was designed and done on basically a totallly amorphous flat landform with basically not a single natural asset going for it.
The hole's length, width, bunkering schemes, green size, angle and shape is completely brilliant and the way that fact is basically borne out and proven in play is year in and year out noone, not even touring pros can seem to figure out the best way to play it.
There are pretty much three distinct tee shot options for good players---to go right, left of try to drive the green or get very close to it.
The point of all this is the test of time has completely proven that these options are in such a complete state of "balance" or "equilibrium" such that noone seems to ever really be able to decide which one is best to use and when.
Essentially, it just doesn't get any better than that with man-made architecture sort of minus natural assets.
That hole is completely text book architecture and the proof of how good it actually works is borne out in the width of the hole's scoring spectrum over the years by all levels of golfers.
I don't have the exact quote so I'll just have to wing it but some sports writer once described Riv's #10 as something like:
"A real hussy sitting alone at the end of a bar with her skirt hitched all the way up, a butt hanging out of her mouth and a look about her that says---Come on over here, boy, and let's see what you think you can do with me."