6200 mile update
After owning the car for almost 6 months, I think I have a clearer picture, and more solidified opinion.
First, the engine and RWD bias are the single best reason to get the car. It isn't cheap speed, more like "moderately priced speed/refinement)."
However, I think there are plenty of things to keep in mind if you're thinking of buying this car, some of which outweigh the good, in my opinion.
To me, this has proven to be a really, really good attempt at simulating a true luxury sports sedan. What do I mean by that?
1. Lets start with the engine, which for the record, I like. With highways being empty due to coronavirus, I've had many opportunities to take my G70, an M340 ixdrive, and oddly enough, a Toyota Camry V6 for *very* spirited drives. The G70 just doesn't have much grunt past 80 MPH compared to the M340, which makes a real strong case about costing $15k more once you get past that speed and into triple digits. The BMW's trasmission, too, was on another level. To me, that's not worth $15k, but you will notice it, and it may matter to you. It defintely mattered when a pack of Porsches rocketed past me, as if physics weren't a thing, and the G70 just could not keep up. I think this car gives a good taste of what to expect in the luxury sports sedan segment, with OK/good enough execution of the powertrain.
2. The interior is well designed and laid out, not question, but for whatever reason, it just doesn't feel as premium as any Lexus, BMW, or Audi. In a vacuum, on its own, it's good, but in comparison, the rubber, leathers, and buttons just don't look or feel as nice. Acoustics are also not the best. For example, the BMW and Toyota Camry were both quieter at 65 and 70 MPH along the same stretch of road in dry conditions. I've heard the Audi A4 is also much quieter, if not the quietest of the German sports sedans. Even some trims of the lowly Ford Fiesta had acoustic windshields. Come on, Genesis. Like the above, I think it gives a good idea of what to expect in this class of car, but does not do it better than anyone else.
3. Build quality is awful, especially compared to the lowly sub $20k econo-boxes I've owned before. Squeaks, rattles, and pops abound. No one should deal with that in a car this expensive. There are many, many more interior issues that I won't be getting into, such as a driver's door that is slightly askew. What really made me feel awful about this is that the Hyundai Elantra loaner my dealer gave me last week felt much more solid over bumps and bad pavement than the G70, because there weren't a million little things moving and shifting above my head, or somewhere in the doors, or behind the dash.
In addition to interior noises, I've had door garnish replaced on both front doors, and my steering column repaired.
My impression is, that unlike Lexus, which goes to great lengths to market how they are built differently than Toyota (separate assembly lines, much better trained workers, a zillion inspections at each stage of production), Genesis cars are probably built in the same factories, by the same workers, and not held to higher quality standards, which certainly would partly explain why the price is so low.
4. Genesis Connected Services seems to be held together by string and a prayer, and even disconnecting the battery from the car can cause up to a 14 day outage requiring a trip to the dealer to fix. In a world where Tesla and other have figured out apps to do things like remote start, Genesis' implementation is just a poor, barely functional copy.
Finally, the dealers are not used to luxury car shoppers. They don't understand that car enthusiasts care about the kind of oil used, and can be OCD about certain other things, which at this price point is justified. "My Sonata makes that noise too" is not something you tell to a customer that spent $50k with you. This isn't a Sonata, it's a Genesis, at least acknowledge that.
#3 and the bad dealers are making me regret my purchase. I fully expected #1 and #2 on my list for the price. But their execution, how they built it, and poor service just kill this car and this brand for me.
I had one issue with my 335i where the engine was overheating; it was a defective cooling fan, which they replaced quickly and painlessly. Otherwise the cars have been solid as could be, and the service experience pleasurable. 
