Wow, I couldn't disagree more and the number of handling awards the MX-5 has won would also suggest otherwise. Under no circumstances has my MX-5 been as unstable as the XRGT. There is no comparison.
The MX-5 is a tail happy car but it is also a balanced one that only slides when you want it to, not on almost every turn of the wheel. Put simply, you have to be trying to drift to get an MX-5 to drift whereas the XRGT, like most of the LFS road cars, you spend half your time working to stop it drifting.