I've honestly been impressed with Hyundai lately.
Hyundai and it's sister cars, Kia, seem to be hitting all the right notes when new. They look good and seem to run well.
Having said that, the theme I keep hearing, seeing and reading about, is that these cars do not age well. For starters, My son has a Sorento which is about 9 years old now, and it has not aged well. Rust showing up everywhere, and lots of mechanical issues. He's reluctant to sink any more money into it, and recently bought a Corolla Hybrid as his daily driver.
My neighbour has a Sante Fe (2016), and recently had a major fight with the dealer about bad injectors. He was caught several times stranded on the road with a dead car. Very unreliable.
I rented a new Kia Soul a few years ago, and I really liked it. A few months later, I rented another one, but with about 35k miles on it. What a piece of junk. It felt, sounded and drove like it had 200k miles on it. It was on it's last legs.
Lastly, Car and Driver took a Stinger on a 40,000 mile long term test. Same results. They loved it when new, but by the time the test was finished, according to them, it looked and felt far worse than a car should feel after only 40k miles.
I could go on, but until they can prove that their cars will stand the test of time, I'll look elsewhere when car shopping.