Actually, it does. Most recently, M9 slip road at Stirling services.
Then we are stuck in deadlock. You'll insist you are right because you have experience, therefore I'm never going to convince you.
Really, common sense? Why are you overlooking the torque figures then? Anyone with the smallest knowledge will recognise that torque figures are a more appropriate way of evaluating a cars acceleration capabilities on paper.
The ML 420CDI has bonkers torque, 516lb/ft iirc where as the M3 has c. 269lb/ft, so almost double. That's why it will keep up with the M3 until about 90 mph and then the M3's superior bhp will start to show effect beyond that. Seriously, get some basic knowledge.
I think its you who needs to go and get some 'basic knowledge'. What you need to focus on is the relationship between torque, revs and power and how this affects performance.
As a clue, you could try explaining how a Honda S2000 with less torque than a lawnmower once absolutely destroyed me when I was driving a 530d with TWICE the torque.
A Golf Diesel has more torque than Vettels championship winning Formula 1 car.
There are different ways to acheive power - you can go for low torque but a high revving engine. You can go for loads of torque through a low revving engine. etc etc. But at the end of the day it is the power figure that matters - torque allows us to understand more how it delivers that power. The ML420CDI will be easier to extract the performance out of, for example, the M3 needs to be driven hard to acheive it's maximum level of performance.
Again, you've got it wrong. I said it would keep up. It does. I've tried it several times.
The problem of course lies in what your definition of keep up is. Were you glued to his bumper the whole way without so much of an inch opening up? Or was he several car lengths ahead because in terms of acceleration a gap of several car lengths is an age.
This is why 'keeping up' is a meaningless barometer of performance and is hugely misleading when people try to claim that being able to 'keep up' says something about the cars performance.
Indeed, and again it appear here you are the master of assumption on the basis of ropey "facts".
How about you make me look daft by showing how my opinion is wrong, if thats what you beleive, rather than simply insulting me? The original M class was a poor car. It was made in America, for America and was poor as a result. I stopped short of saying the same about the newer shape and made a point of doing so!
Seriously, back off. You have no idea what you are talking about.
You seem to be a lone voice in this thread. Even BigT has described an ML encounter and that was an ML63! A massively faster car.