That's because, wherever you stand on BMW's evolution of the M brand, the cars are consistently, quantitatively, impressively good on track. That has not changed for the 2013 M5 and M6.
If anything, BMW's larger M cars are better than they ever have been. Sure, they're loaded to the gills with electronics, safety aids, HUDs, and audiophile-grade stereos, but they're also packed solid with capable suspensions, impressive dynamic dampers, surprisingly good steering, and massive grip levels. Married, these two schools of thought--essentially, luxury and performance--come to one of their best possible expressions in the M5 and M6.
On track, the difference between the four-door M5 and the M6 coupe isn't as pronounced as you'd think; both are very good. The M5 feels a bit longer, a bit heavier, and a bit less nimble as a result. It is. But it's still incredibly capable and, even more to the point, incredible fun, for a luxury street car.
And that, truly, is the element missed by the naysayers of BMW's current M brand offerings. No, none of the primary M vehicles are focused track day cars. No, they're not going to win races off the showroom floor. And no, they're not even the fastest cars around a circuit for the price. But that's not the point BMW is trying to make, and it's not the point any sane buyer would try to pay to prove.
Instead, these cars are, ultimately, about the total driving experience, from a luxurious highway cruise with your significant other, to the daily slog through traffic, to the occasional weekend at a facility like Mazda Raceway Laguna Seca. The number of cars that can successfully navigate all three of these scenarios at the level of the 2013 M5 or M6 can be counted on one hand--with maybe a finger or two from the other.
OK, so BMW hasn't lost the plot, but perhaps refined and expanded it. The M car is no longer an action movie: brilliant fun when things are hot and heavy, but otherwise, plagued by bad dialogue and one-dimensional characters. Instead, it's more of a Simon Pegg/Nick Frost RomZomCom, if it were set at a five-star resort: there's something here for everyone to love.
2013 BMW M6
One key difference, from a driver's perspective, is that the M6 comes only with the M-DCT dual-clutch gearbox; the M5 can be had with that high-tech solution, or a traditional six-speed manual. For both street and track use, in these cars, we prefer the M-DCT. It's easier on the street, and it's quicker on the track. BMW's manual gear boxes--or at least the shifters--just aren't the slick, controlled, economy-of-movement pieces you want on a satisfying row-your-own setup. The M5 manual does have a neat feature, however: it automatically blips the throttle on moderate-speed downshifts to second gear. The only circumstances where we noticed its function was slowing from moderate highway speeds to pull into store parking lots, typically downshifting for second at around 20 mph.