I have driven a couple cars that have more "brutal" acceleration than the M3, but the M3 is constantly fast. The 400awhp STi I drove was scary fast and pulled hard to 140mph, but after 120mph I think the M3 would pull on it. Same thing w/ my father's 500bhp Factory Five Cobra. It may do 0-100mph in 5.9sec, but I wouldn't drive it any faster than 120mph. M3 feels solid even at 168mph indicated.
"The laws of physics cannot be repealed, even with DSC." - BMW Owner's Manual