You are correct with the understeering and average boxes standard.
My brother has one that goes very well,but now has ppg box and good suspension..as these and stock brakes are average.
They are a good little car setup properly & can be picked up very cheap now..and dont suffer the same oil problems as gtr's.
GTiR has absolutely no similarities to the ATTESA system used on the GT-R, apart from that they are in essence both 4WD. The GTR system uses a RWD setup, which when overcome by slip/torque (detected by G meters) it transfers torque to the front wheels, therefore giving 4WD. Whereas, the system used on the Bluebird and GTiR is your simple centre LSD with a 50/50 split front to rear with no electronic variation in torque split