I still say its all about who wants to go the fastest. If you want to be very comfy and have a quick car get an M3, if you want to go faster and still have an "involved" car then you have to make sacrifices in comfort. If you want comfort and speed then you make sacrifices in the "involved" feel of the car. As for the car driving itself, yes a paddle shifted car like the GTR can make an idiot go fast in a straight line but the car still doesn't turn itself or hit the brakes for you. The driver still has to be good to get good times. If you want a pure fun car to drive get a Miata, if you want a fast luxury coupe, get an M3 if your want a fast ass car in any conditions wait for the Vspec next year.
Now for everyone saying the M3 has heritage or soul and the GTR doesn't. Lets look at who has held true to the cars heritage. Both cars started as homolagation cars in the eighties. The M3 was a lightweight high revving no frills performance car. Yes it had leather but they were very supportive sport seats and only had 2 doors. It was made as a purist car and had to be driven to be fast. The R32 GTR came in as a heavier, more powerful car with AWD and twin turbos to make the most out of any engine. They used technology to make the car faster, that's what you do to win races. I won't even go into the disappointment that the E36 M3 was, car got fatter, more luxury, and only a marginal power bump from the Evo3's 215hp. The R33 GTR got a little fatter but got much more rigid and some more technology and the car got faster. Then the E46 M3 finally got its balls back but it still got fatter and more toned down. It got some more power and more technology with traction control and stability control to help the car go faster. The R34 GTR weighed about the same, got a better suspension, better AWD system, better turbos, less lag, more power, more rigid, and looked the part of a sports coupe, mean yet tasteful enough to park at the country club if we had them. The E92 gained even more weight, got more luxury, more driving aids, more technology to compensate and a decent power bump to make it fast enough. The R35 is still using a 6 cylinder twin turbo AWD platform to squeeze as much performance as you can out of a performance coupe and BMW has changed their setup yet again. When you look at the two cars heritage the GTR has held very true to its roots of race proven performance and high power AWD. The only trend BMW has upheld with the M3's is adding more weight and making the car something it wasn't meant to be. Yes the M3 is the most winning car in racing history but except for the E30 the race versions are far from the street versions. And the group A R32's were a far departure from the normal GTR I know.