I agree with Sayantsi and jwaters. The Genesis suspension issue comes down to
personal preference. From everything I've heard/read/seen, there no basis for an empirical qualitative judgment of good or bad. Some people love it, others loathe it... many of us are somewhere in between.
What I personally dislike is hearing the allegations (many of which located in this thread) that Hyundai is somehow negligent or unprofessional in their response to an issue that is so incredibly subjective. Nowhere have I found an overwhelming outcry about this, other than the continued cycle repeated on this forum. The (admittedly extremely non-scientific) poll conducted here showed that many more Genesis owners liked or loved their car's ride than disliked or hated it. More expert reviewers have been okay with->impressed with the car's ride than unhappy->unimpressed (though there have been several comments about inconsistent unsettledness on certain surfaces at certain speeds, this was of bigger concern for some than others).
All that said, the crux of this comes down to three things. To those who have issue with the car, but more specifically, Hyundai:
You were not deceived, you were not put in danger, and there's no reason this "issue" should have been a surprise to you.
You purchased a brand new,
first model year near-luxury vehicle at a great price. You shelled out $30-45k, when all was said and done, for a car "worth" $5-25k more (for comparably equipped competitors' models). An extensive test drive should be the prerequisite to this purchase - especially if you're the type of person who is sensitive to how a car rides. It's not about blaming the customer over the seller, it's about the reality of the situation.
My family purchased a pre-owned Genesis privately from a man who found the ride bumpy, unsettled, jarring and generally annoying. We took it for a test drive and were more than satisfied with the ride. We bought it. We've had no complaints since. We've had ~10 passengers in the vehicle since... not one comment about the ride. A lot of positives about the interior, sound, roominess, etc.!

The previous owner was coming from a Lexus; we're coming from a Pontiac Montana and Mini Cooper. THAT righ there is the difference. What you're used to and what you expect.
The issue at hand is not one of safety. It is not one of honesty. It is not one of loyalty or respect or service. It's one of preference alone. Everyone is entitled to their own opinion, but there is no reason for Hyundai to shoulder the blame here. Our seller had a hard time letting go of that Genesis, but he was honest enough to realize that
he didn't test drive it and as a result, the car just wasn't what he expected.