I for one, CAN attest to the quality in Hyundai products as I've owned two for the past 2-3 years.
2004 Sonata - About to hit 60K miles. Never in the shop for anything. All I've done is oil changes and brakes at around 45K. That's it.
2005 Santa Fe - About to hit 12K miles (had it two years, but its the wife's and she doesn't drive much). Again, no problems, just oil changes.
No squeaks or rattles either have developed on either, nor any trim or wear problems. They both look like the day I bought them. Now, I don't think I'm an exception to the rule. Would I recommend a Hyundai to someone? Absolutely. Did I buy either of them with sporting intentions. No. The Sonata was to throw miles on and the Santa Fe was to replace my wife's old Jeep and have something to get her through the snow and fit strollers in the back. They are what they are and they are good at it.
Would I take either up to 147mph? No, but then again, I never had any of my Mustangs over 110 mph either.
Again, I like the driving dynamics of the previous generation Sonata over the new one...that's based on driving both. I do like the trunk and size of the newer Sonata better though.