Its nice knowing you CAN, but you don't have to use its advantage.
I don't think the 4*4 debate will ever go away, people will always have something to say and why not its all good.
My last car was a 330ci Bmw and I reached its limit once in Europe (top speed) in the UK I find that I actually drive that car slower than other cars just cruising round.
With my ML I feel so much safer on a busy motorway with family in back and trucks all around especially when its throwing it down. It also pulls our van with ease and fits an awful lot of stuff in it. I'm quite happy with its performance and it has been know that I drove up a kerb once
Many people probably drive large engined mercs (or whatever) and don't use anything like the performance, heck my dad has a 500SL and doubt thats been above 80 (sorry 70). Does he care? NO.
Very few owners of newer 4x4's will go off road as their car is too expensive if damaged, in the same way very few AMG car owners will put their cars on the track to get any where near the potential. Most will probably only ever do the traffic light run...or join a slip road giving it beans.
I've been a passenger in a E55 estate several times and legal speeds are reached so quick it would be hard to use the power on normal roads. Overtaking me on a A road towing the van is possibly one time it would be handy.
My next car may well be a 'quick' estate of some sort but for me its the looks and knowing it can go quick is enough, I don't HAVE to drive it that way. My ML as Gucci does what I want for now and I like the looks.
Just drive what you want and enjoy it. We will never agree, but having owned sports cars, hatchbacks, 4x4's and convertible I have enjoyed them all as they suit what I wanted at the time.
right I'm going to order some spray on mud for my ML...