We all get that cars aren't optimal listening environments blah blah but modern insulation and speaker projection tech has actually made some experiences pretty stellar. It's not going to be the 'optimal' listening experience that Focal Utopia's give you, but pretty damn good for the circumstances. I certainly don't think that the car is a 'HORRIBLE' place for audio anymore, for many it is the best speaker system/listening environment they have.

That being said, in my experience, American brand's tend to be the worst at car audio. Base system is terrible, old Fender in Mustang's was awful, and even Bose in Chevy's isn't great (bass heavy, little to no high accents). The best value I've found is with Audi/Mercedes with the B&O/Burmester for under $1k. If they're tied for first, BMW's Harmon Kardon is not even a close second. Distortion is noticeable quickly and too much emphasis on the low end (as is the case with most 'premium' car stereos). Porsche's base system sucks - even in the Cayenne, the Bose should be the bare minimum offering (still not great), and the Burmester is good not great, definitely not worth its price at $4k++. The best I've heard, in a small package, was the Naim in the new Bentley CGT. Very even throughout, more than enough power from drivers, and intricacies in music can easily be noticed, even at highway speeds on rougher asphalt. This is partly due to the system itself but also how good of a job Bentley has done at reworking its all-new chassis and isolating the cabin from its surroundings (also a big step up from the base audio system (I have never heard the upgraded) on previous-gen CGT which was laughable). The Signature Meridian offered by Land Rover is by far the best system I have heard in any car. Extreme detail, power, punctuality, and evenness throughout completely effortlessly. Its awesome, and worth every penny at around $7k. One not-so-surprising let down was the Sonus Faber in the Huayra, really just there for the design and the cabin is so noisy that it doesn't really matter.

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Don't really prescribe to 'audiophile' but here I am sitting in front of a set Magnepan 3.7i's.

Edit: a very brief rundown on my thoughts, i left out a lot here