I prefer to think of the fun to drive (FTD) index. FTD is a combination of acceleration, revability, steering feel/responsiveness, handling, flingability, braking feel/power, cool sounds & hard to quantify "soul".
M3 is the benchmark, the standard to judge by a "10" S4 maybe 9.5.
SVT while slower scores big in many of these areas a solid "9".
Civic Si & Integra score well too even though slower "8.5", Neon sport, 3 series, A4 = 8.0, Maxima 7.5, GTP 7.5 (big thrust points)
Most sedans under 35K would be under 7 on this scale. To me this is what counts most on the street - the way you feel when you strap the thing on. Racetrack is a different story. On this bang for buck meter, SVT kicks ass.

Dan


1999 Amazon Green SVT Contour (#554/2760)
Stock SVT Duratec V6 with:
Intake- K&N filter/75mm MAF meter
Exhaust- MSDS Y-pipe/Bassani catback
Durability-Ford "dual mode" damper, Mobil 1/K&N oil filter
179.2 FWHP at 6900 RPM