That's why most of the time I try not to even bother with America/etc servers. There's a different frame of mind going on most of the time between the two, just like sai said there's a common courtesy in japanese servers, and a general appreciation/respect for each driver and the cars.
Now that's not to say that every japanese driver is a pro, because they aren't, but they are definately more modest and humble about their driving. And if they're driving well, they don't need a room name to make it apparent.
Alot of people should take note.. or at least I hope so.