Done both the Norwegian roads. Ironically, neither is really remotely the best that Norway has to offer, in my view - Trollstigen is just a slow crawl up the side of a mountain while dodging tourist buses and cars, especially combined with my healthy respect for heights. The views are fantastic, the riding sub-par. Same goes for the Atlantic road, it's really nothing to write home about once you get on it, that bridge pictured is basically the only cool thing about it from a riding perspective and you pass that in 20 seconds. The rest is just a road along the ocean.
Now, the rest of Norwegian fjord country is unbelievable. Decent quality pavement, incredible climbs and dips, sweeping corners along the wall of a fjord, bypassing the long tunnels by going over the mountains on the old road the tunnel replaced... I was laughing in my helmet for several stretches of it, just taken aback by it all. The weather is often rainy but two years ago I managed to luck out and get three days of warm sunshine and it was by far the most fun I've had on a touring bike.
So it's funny that some of the least impressive riding bits in Norway get picked to be in that list, at least if we're talking the quality of the ride rather than the quality of the views.