I could be wrong but I think beyond that it's also highly regional/cultural.
Teslas look awful to me; they remind me of so many other examples of recent bland US car design: particularly Ford, and with a few hints of the sort of 90s-mazda-esque Corvettes of the past 10-15 years. All very popular aesthetically but to me seem a bit lacking in anything unusual or novel. I would say the same of a fair amount of Japanese car design.
European car design (particularly French, Italian) is often ugly, usually novel, sometimes beautiful. Germans are a bit more conservative (especially VW), but they definitely have their moments.
I am European so I may simply be missing the nuance of non-European design.