^You're not alone. I've said it many times for myself: I find the Gr4 cars boring. They just lack the spice of what I am looking for in a race/track car. Ie, there is virtually no consequence for over driving it. Aka, they're just too easy to control, especially the AWD cars which are META all the time anyway (and for that very reason). And that is not me saying I am too good for them but I really don't feel like one should be able to just pin the throttle coming out of a slow turn and the car just goes. A Gr3 car would never allow for that; the Gr4 cars' road going counterparts would never allow for that. But somehow, the Gr4 car you can just mash the throttle like it's a binary switch and off it goes.
I feel like the art of driving fast is you're ALWAYS flirting with disaster. How much throttle can I give this car coming out of the turn such I get the best exit possible while almost crashing/spinning but not quite! If you're too safe, you're slow; if you're too aggressive, you spin. But finding that balance for every turn on the track where you're a 'cat' hair away from dying at every non-straightaway moment is what make's the driver's adrenaline really get going... especially when you're door-to-door with another driver. That is what seperates a good driver, from a great one, from an alien (and not just on GT but in real racing too of course).
The Gr4 cars just don't get that, IMO. Gr1, Gr2, Gr3, and especially road cars you have to drive them like above. But Gr4 falls into a gray area where you really don't. They're basically de-tuned versions of their road going counterparts with sticky tires and more aero. I think it was
@GOTMAXPOWER who recently said that putting street tires on them would make them more lively, and I agree. Or, backing down on any of the three things mentioned (more power, less areo, or non-slicks) would likely be enough as well but something has got to give to make them fun IMO. But, it'll never change.
Anyway, I'll go yell at the clouds. But since Gr4 are virtually always one of the Daily races, I can basically scratch 33% of every week's combo off right away. It's not that I refuse to drive them, but they're just so uninspiring and just plain boring to me it's usually not worth it at this point in the game's life, especially since the Lambo is OP every week anyway.
YMMV
