I don't think BMW setup the camber to be adequate for serious track use. During my PCD, I noticed that the M3 I was in had pretty bad wear on the outer edges as well as the M5s that the instructors were driving.
I think wider front tires with more negative camber will usually be a given at the track for those who are pretty fast drivers.
Comparing the M3 to other cars...I think the fact that we can get almost 2 degrees in the front is pretty good.
2013 F30 328i Melbourne Red
2011 E90 M3 Monte Carlo Blue
2004 E46 M3 Imola Red