The racing that I saw in London in no way represents the kind of racing I've seen and experienced with the good to great racers in the GT series. The best racers can line up with the very best in any game in terms of ability and etiquette, that has been my experience and I have no doubt it'll be the case as this game moves forward. I chalk up the inconsistency to the lack of familiarity with the equipment, poor conditions for concentration, poor sound feedback, lack of practice, overall atmosphere etc. I don't expect to see that kind of erratic driving in anything even close to the upper echelons of the FIA sanctioned races.
To be clear, I'm talking about the drivers themselves, not the physics or netcode as it were.