What you could argue is that sound is purely subjective. This I can say with some authority as I'm a Professional Sound Engineer. There IS a lot of buying stuff because the badge is X or Y or Z.....
Boils down to how is actually sounds imho

I've got JBL stuff in my studio (also got some Genelec and Dynaudio

), and have used a fair bit of it a pro level (high end audio, not car stuff admittedly) - it's got a characteristic that is quite "warm". A trait that is quite "marmite" - you either love it or hate it!!

Like with ANY brand, there are goodies and real lemons..... JBL are no different.
I personally like a warm sound (if I could valve-amp out my car, I would!!!

) and JBL stuff (some of it anyway) would suit the bill. I've focal and infinity stuff in previous cars, and
imho it was too bright/harsh. Other passengers loved it though.
On a similar note, I had an Audi S4 with Bose - to my ears, I thought it sounded fantastic, not much mid, and as a whole not very accurate, but for what it was (out of the box), blinkin' great.
I think the moral is don't knock anything until you've actually tried it, as it might just suit YOUR purposes, and nobody can argue the toss about what you listen to and why you listen to it.
Besides, we could all have the same setup, and due to how we hear it, it will sound different - one of the virtues of being human

Just my 2p

Dan