Well me and my mates all passed 1st time, I passed with 1 minor after 18 lessons with no non-instructor driving. I'm not saying every young driver is good, it depends on the individual but I would argue that reactions etc. do help I also believe that our control, lane discipline, observation, judgement and hazard perception are probably much higher than the average standard seeing as I know the highway code, got 35/35 68/75 in theory test, regularly checking mirrors and not being lazy with indicators and lanes like old drivers.
It could be argued that young drivers are a big liability and it's true that many are, due to boy racers etc. a high percentage of accidents and that is reflected in insurance premiums, but sensible young drivers are certainly the best, I'm intending to build a rally car soon and enter and win many races.