Gaaaaaaaah
Right, I'll take this nice and slowly.
Lap times
don't matter for road cars. They don't even matter as an indication of how quick a car might get down a country road from point A to point B.
Firstly, this is because country roads have lots of varied corners, bumps, dips, gravel, cow excrament, tractors, sheep, and ramblers. A racetrack has corners and straights, and that's pretty much it. So a car that can steam along a race track faster than it's peers might not necessarily be suited to the road. Apart from anything, a car that handles a racetrack in it's stride may feel out of it's depth on the road, or might be plain scary. This is one reason why lap times don't matter to road driving.
The second reason is that you seem to be implying that in flat out driving a hot hatch would be quicker. And it probably would. But anyone with half a brain won't be driving at 10/10ths on the roads anyway, so saying a particular car is "quicker" is irrelevant. I could drive a Nissan Micra at 10/10ths and be "quicker" than a Ferrari driven at 1/10ths, but the chances are I'd be driving pretty illegally, on the aforementioned unpredictable country road. So to conclude point number 2, flat out track driving has no place on the roads so performance comparison is irrelevant.
Despite all this, you could drive an S2000 down a country road and probably have more fun than in your cocooned wheelspinny hot hatch, regardless of whether the hot hatch was quicker. Sports cars aren't necessarily about getting from point A to point B quickly. If they were, then surely things like Triumph Spitfires, Austin-Healey Sprites and MG Bs would be useless, as most modern superminis would demolish them on a country road.
People buy sports cars because they look great and they're fun. And that's pretty much it. By all means buy a hot hatch and be quicker, but down the same stretch of road, with the hood down, a sports car would be more fun for most people. Given the choice of a basic Porsche Cayman with 245bhp at £30k and a 250bhp hot hatch at £20, I'd galdly spend the extra £10k to go more slowly and have more fun.
In this discussion or in general?