If models not being meticulously correct to reality is gonna upset you, I'll save you some time...get out. EVERY TXR game has had odd bits, some worse than others. If the models being off is enough to ruin your experience, don't bother with the game, because I can guarantee you'll find a dozen other things before the third run is over that will upset you.
Personally, I'm tired of looking at molecularly correct cars that I'll never use once. I'd rather have one that has potential to be fun because once I start driving, I'm not looking at the car I'm driving...I'm trying to dodge the BS traffic that spawned just out of sight again.