Nothing wrong with the FIAT 500 at all, especially the Sport and Abarth models. My son owns a '15 Sport that just turned 30K miles on it. Triple black, with leather and glass sunroof. Nothing "Chrysler" about them! In fact, when it comes to dealer support, the Chrysler/Dodge/Jeep/Ram dealers are not permitted to do warranty work on them, nor can a FIAT/Alfa dealer do the same on CDJR vehicles. They keep their distance, as they should, because they really aren't "one company".
Tell ya what, I drove my son's car from OKC to Dallas and back on two occasions recently, with each being a 500-mile round trip. At 80 mph, the car gets 42 mpg. Yeah, you're the smallest car on the freeway, but it really doesn't feel like it. They are very competent drivers, handle very well, and are actually comfortable to drive that kind of distance. It's my son's first new car. It's only had one real issue to speak of, and that was a faulty RF strut at 27K miles...new struts and tires, and it was like new again.
Would buy one for myself? Sure, but I've also driven a 2018 VW Jetta TLI sedan (gas engine). That beast got 47 mpg @ speeds from 70-85 mph, with a 2.0L Four with automatic. The worst mileage I got on the 2,230-mile trip I drove it on was 39, and that was in the Rockies. Were I to buy a new car right now, I'd be all over either a Jetta or Passat. I'm far more impressed with those than a Charger or 300 these days. Both VWs have a trunk you can actually PUT four bodies in, if you were so inclined. Nice, comfortable, and under $29K for either, nicely loaded.