I give quite of bit of detailed feedback on class balance for GT2/GT3 in the following links. While I’m sure some top players may differ on minor analysis, most I’ve had discussion with on Forzaverse agree the Porsche in GT2 is OP all the way around, the Ford GT needs a serious boost, and that the NSX and 15 Lambo are overtuned. There are disagreements on the Ferrari being underpowered in GT2 (some just feel it feel bad to drive, but isn’t underpowered) and some feel the Audi and 18 Lambo are still too strong in GT3.
Go vote and maybe they will pay attention.