You pick one race to prove your point? I'm pretty sure we're talking about engineertin sports cars on the street as well. A lot of different factors go into racing. Fact is the BMW M cars are the benchmark for their class, and have been for years. Until you've owned one I'm not sure how you can comment on the engineering. They put any American sports car I've driven to shame. The new DCT is simply amazing. Looks, performance, luxury. You won't find it in any American sports car. There is a reason why Ford is trying to make their Mustangs resemble a BMW M4 now. They're doing a shitty job of it by the way. Every other car manufacturer is trying to make their cars resemble BMW as well. Alfa Romeo just came out with the Guilia that is a copy of the BMW M3. Go drive an M4 and see for yourself.
And BMW seemingly with all their engineering, they screw up their M engines. The S54 was blowing rods, and BMW at first blamed US drivers who had manuals. Then the SMG ones started throwing rods. Then it was another thing. The S65 had rod bearing failures. And now the N55/S55 has crank hub failure.
Also, a lot of people on BMW M forums have cross shopped or seriously looked at the Mustang Shelby GT350, with a bespoked Voodoo V8. That is a plus for people. The head of BMW had already said that there will not be anymore bespoked M engines (like S54, S65, S85, S62). But that they will closely related to or tuned versions of production engines.
The Mustang also is the leading sporty car in Germany, home of BMW.
A lot of people are raving about the Alfa Romeo Giulia Quadrifoglio Verde, even BMW M owners. And the engine is basically a Ferrari V8 with two cylinders looped off. Who know about their reliability, though.
Let's not dismiss the American makes---they are making good cars. The Corvette has done well in international racing, and BMW no longer races the M4 in the same category as the 911, Corvette anymore. The M6 is not even that competitive.
Nevertheless, BMW is a good brand and yes the Ms are benchmarks. It has been said that Cadillac is what BMW used to be.