My experience as a european, so might not apply to NA people, or anyone for that matter, as im no mechanic or expert, so take this with a big grain of salt.

Japanese - often very reliable, but they are a little dull, but overall good cars in my opinion. Only complaint is the subpar rust protection on older models.

German cars - decent reliability on average but higher maintenance and repair costs (audi, mercedes, bmw) good handling, and they feel very sturdy, even at higher speeds. I like their diesels alot.

American - good economy cars, interesting features. Interior quality is ok, ok handling. Old ones are very reliable but are big gas guzzlers, so they do not make sense to own. Newer ones i do not know, Ford fairs suprisingly good in reliability studies in my country, (people trash talk them for some reason, so suprising). Chevrolet and Jeep are close to bottom. I see a few old trans sport v6’s and grand cherokees though.

Korean i do not know.