I guess you haven’t really driven one but I have.
I personally tracked a MS6 at dunnville and I got the entire car to get sideways with ease and kept it that way. I’ve done A LOT of drifting when owning a 240 and my driving style fully compliments that of a RWD car and the MS6 definitely did not feel like one. Didn’t feel the slightest characteristic of FWD, but I guess that is also because of the slight suspension mods (swaybars & koni shocks).
I do agree that the MS6 stock, does drive like crap but what OEM car doesn’t?
If you mod the suspension slightly, it definitely does not handle like FWD garbage. I was keeping up with s13s with 230whp and other subaru’s as well.