The inherent flaw in the X5/X6M is... they didn't make it more driver oriented.
It still has the all-conquering X-Drive and Dynamic Performance Control... which means active anti-roll bars, torque-shuffling differentials... etcetera, etcetera, ad nauseum.
When I drove the X6, I thought... boy, this thing would be so much more fun if it weighed half-a-ton less and didn't have Fraulein Stabilischen looking over my shoulder every time I tried to get it crosswise through a chicane or hairpin. And note... the base X6
is fun. As surprisingly fun as your first go in the X5... only more so, because it's better. It carves better than most road cars, the steering isn't complete crud and it's a right gas when you're booking it across broken ground.
The fun ends when you brake late into a corner and feel the DPC juggling the differentials to get you turned in properly... when you do a Scandinavian flick and find that the stability control doesn't like that... and torque gets shuttled towards the bow to get the ship on an even keel.
My wish-list for the X6 would be less weight, rear-wheel drive and fully-killable driving aids... though I'd keep the active anti-roll bars... those things are amazing... they ought to put them on every production car on the planet.
So... what do they do with the X6M? They make it the
heaviest X6 to date... ruining the balance (since a lot of the weight is up front, where you don't want it) and making the X6 finally drive and feel like the porker it really is. Oh... and it still won't oversteer.
I disagree that the X6 is inherently compromised as a car (except for that small factor of the missing rear middle seat... but that's like saying no SUV is truly complete without a three-across third row...)... but the X6M doesn't improve on it in the way an "M" model should. Instead of getting something like a road-going Paris-Dakar X6 special, we get a BMW-branded AMG SUV.
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A good example of the way an "M" model should improve upon the base model... the current M3. Sure, it's in danger of being overshadowed, power-wise, by tuned versions of the twin-turbo inline sixes... but it's still a purer driver's car than the 335i or 335d... and that's all that really matters, for the M brand.