I think it's a good idea if it's not abused... i.e. it's a road that happens to be a great drive, but can also be recommended because there's a nice pub along the way, or it goes through a place worth visiting...
Or it might just have lots of nutjobs intent on killing themselves posting up 'lap times', which is what happened on a forum I used to a visit. Ironically, two lads ended up in intensive care when they were racing each other, and they crashed into each other... going from opposite ends... and they met in the middle.
It's six of one, and half a dozen of the other, really depends if people on here can be trusted with gold dust information of a good, fast, challenging road. I think it's a nice idea.