I don't think they are going down the wrong track ... if you are after a car that is all out performance then yes, a big heavy 4 door sedan is not ideal. HSV is all about making the big sedan about as performance oriented as it can get. I love our V8s (I have 3 of them !!!), they are bloody quick, very comfortable, look great (IMO anyway) and more than enough room to load up the family, fill up the boot and head off on holidays. They are sensational highway cars, overtake with ease, cruise at 100 km/h with less than 2000 rpm on the clock and bucket loads of torque ready to get you moving when you need to ... and the kids can sit in the back and watch a DVD.
Now clearly something that is designed to do all this is never going to be able to do what a GT-R can do ... but a GT-R couldn't take me and the family on holidays comfortably either. Very different cars with very different roles to play ... personally, I love all of them.