I think this is a hard question to answer as the South Korean vehicles have evolved much over the last couple of decades. They came to the US market with a low cost, low quality strategy. They built capital and started hiring away engineers and designers from European manufacturers. Currently, they are selling much nicer vehicles. They aren't dirt cheap like they were in the past, but they seem to be a pretty good value.
Anecdotal evidence aside - according to a 2022 J.D. Power U.S. Vehicle Dependability Study, Hyundai is one of the most dependable brands, ranking higher than brands such as Toyota, Lexus, Honda, Mazda, and BMW. Additionally, Repair Pal has ranked Hyundai 4th in reliability out of 32 car brands.
I think it depends on what you want in a car. I enjoy the luxury touches of their higher trim packages without the luxury brand price tag.
I've owned a '21 Kia Telluride, '24 Hyundai Santa Fe Hybrid, and I just picked up a '24 Hyundai Ioniq 5 a couple weeks ago. I also have a 2018 Honda Accord. When I set out to buy the most recent vehicle, I was determined tot purchase a non-Korean vehicle, but after test driving a variety of vehicles, within the framework of what I wanted the Ioniq 5 was too hard to beat. I wanted to like the Honda Prologue, but the interior was meh at the top trim level. I wanted to like the Equinox EV, but I didn't. I wound up leasing the Ioniq 5. I guess I'll give it another go in December 2027.
I say research the specific vehicle you're interested in (YouTube, Edmunds, Car and Driver, message boards, etc.) vs using potentially outdated manufacturer reputation as the primary guidepost. This is true across all manufacturers. In my experience though, the post 2020 South Korean vehicles are a pretty good value and I haven't had any significant issues to date. Best of luck in your search.