Straight into a hairpin is just as much about when to brake as straight into an R2. You have to brake for both of them, and then you can't just gun it again right away. Personally, I would prefer it with the straight into the hairpin, but it would be easy to flip the layout and run it the other way. For that matter, if people wanted to, they could test their cars both ways. I don't know about real racing, but racing video games often give you the option to race a track in reverse.
In all cases, the skill of the driver will determine the best lap, but that's why the driver does multiple laps and takes the best time, not an average. That's also why it should be allowed for an improving driver to revisit and re-post new results for cars, even if no changes have been made to the car.
As has been pointed out, the idea is to figure out what kinds of cars are good racing matches for each other, but it can also be a bit of a challenge between racers. Same layout, same car, who gets the best lap, and why? Stronger magnet? Better controller? Better/cleaner surface and tires? Better tuning? Better driving? All these things factor in, but as long as people don't make up their times, then it's all in fun.
I'll be using a PB-Pro, so can report lap times to the 1/1000's (three decimal places) which I think is useful for such a small track. I'll be specifying digital or analog, since the chip reduces power a little.