Best online race i ever had in GT5 was me in a R390 Road Version against max tuned Blitz Dunlop ER34 Skyline (both of us on Sports Hard's). I get your point, and agree, but the R390 "Road Version" is a car that should definitely NOT be eliminated from the roster.
The real problem with those lobbies is allowing racing tires. Sport Hard's really level the playing field against people with high HP & Aero "street cars"... turns out those people don't know how to handle the power without slicks, and its actually very rewarding to topple them in lesser cars.
You´re 100% right, i don´t want to lose a lot of great cars like this very R390.
It´s all about how the kids set up their lobbies, and unfortunately, when i look for lobbies that have more than 10 people on it, it usually means street cars + aero package + racing slicks.
I was a racing soft guy myself when i was younger, but more and more i believe the game should be played the right way.
The physics system does not adapt to the changes in parts. The low aero effects of the street cars makes them snap and loose at high speeds, but the racing tires kind of bounce them back giving an unrealistic effect on handling.
Even if you put racing slicks on a regular car, it would not behave like that because of the chassis and suspension, even if those are tuned, it wouldn´t behave like a race car. Full blown conversions like the TC cars is a different thing, but racing slicks magically fixing any car is just too Need for Speed to be in this game.
Also, tuning is broken and i say this having spent hours in previous titls setting up cars. All these tunes avaliable on GTP and other places are just fancy stuff to make your car more confortable. Very few things matter when tuning for GT5, and this is probable due to limitations on their physics engine.
Tuning had a great effect in lap times in games like GT1 and GT2, but of course it was bare bones and had exploits. Now it looks like the entire suspension setup is useless, and few things really make a difference.
Bringing back something i said in the regular GT5 thread, that helps making the shuffle races so fun. You play the cars the best way the game can simulate, without any BS.