Hi Si,
Remembering the roverload and rover tech days haha
Is your m3 manual or auto.
In the m5 the slightest hint of spin and the standard traction kicks and and murders the power for a few seconds, it's actually a bit dangerous if you ask me where your briskly pulling out of a t junction or Round about and your robbed of your power.
This can be said for fast a lane driving too, So for most who are aggressive drivers or inexperienced this would be annoying, it does sort the car out but it is so hard to push on.
MDM mode really looks after this a lot more, you can really let the car go and yes at times there slip, but it's actually a lot less than you realise, you can power up and out of corners so much much easier without traction comming in at all. Incidentally it did cut in once when i was on the throttle to hard to soon and it quickly taught me as i was a tad sideways haha
I am not sure if the m3 is the same. I have seen quite a in depth review over manual Vs dct over the past few days and 3 guys took m3s out in both guises, quite surprisingly they all preferred the manual, mainly for having a lot more control or it felt like it to them.
Tbh it amazes me these sort of cars can be sold to just anybody, regardless of rwd or 4wd the speeds they can do and so fast should be restricted to people who have done additional courses or something, a friend of mine is about to buy a m4 but hes not a driver, he's a poser and I am not sure this type of buyer realises how out of their depth they could find themselves if they stick traction off.