I've enjoyed my one Hyundai. It continues to be a great car for the price. That said, Hyundai's (and Kia's) dealerships are the absolute worst. I've yet to find a good one. It's unfortunate, because it lets down an otherwise great car.
The Hyundai dealer I used for my previous 2011 Sonata was great at first, but service quality gradually dropped over the course of 5 years as they became more and more popular and got busier. The night that I bought the car, it took almost 4 hours to take delivery and it was mid-week with only 2 customers in the dealership actually purchasing.
While shopping at the time I also visited another high volume dealership in a neighboring town. They had $8,000 "market adjustments" on ALL of their cars, which is how they were able to advertise huge discounts on Hyundais. They would simply take off the market adjustment and you still ended up paying sticker. When I questioned the sales person, he simply said "oh, you can ignore that. we don't make anyone pay the market adjustment." After test driving a Sonata there, I wasn't sure I wanted to buy right then and there. I was coming from a V6 Impala, and Hyundai had stopped offering a V6 Sonata for the 2011 model year. When I expressed some hesitance to going from a V6 to a 4cyl, the sales manager actually came out and said to me "so you are the guy who doesn't think our 4cyl Sonata is good enough for you? You know, V6 powered cars are going away soon so you need to make up your mind sooner or later." Then he just walked away. As I was leaving I had to walk through the service department, and they had a big sign that said "All Hyundai vehicles have a timing belt that requires replacement at 65,000 miles. If you do not get this service done, your 100K mile powertrain warranty is null and void. No exceptions." Nice...really classy.
I had my fair share of problems with my 2011 Sonata, and between routine maintenance, recalls, and repairs visited the dealer probably 30 times over 5 years. They actually knew me and would great me by name when I arrived for service, which I am not sure is a good thing. When I was shopping for a new car, I did test drive a new 2015 Sonata 2.0T and the dealer said "we know you didn't have the best experience with your 2011, but we are sure you would like this one much better!" Despite a discount of $5,000 off, I just couldn't commit to another long term relationship with a Hyundai at that point.