Here's a little more for the flames
GM's LSx series of engines does impress in some very important ways: It's the cheapest way to make that much power, it's a lightweight package when considering its output, and it's reliable while doing so. Nobody would argue that they've made the pushrod engine far more capable than anyone would have imagined when all the OHC engines came onto the scene.
That said, you can bet I'm no Genesis shill. My grandparents have an LS460 (along with a 430) and will not buy another one after seeing the Genesis sedan. I have extensive seat time in the 460 and it's just not worth double the cost of a Genesis except for snob appeal.
My brother has an LS430 and is going to trade it on a Genesis. His other car is a Mercedes CL65 AMG so it's not like he doesn't know what a real luxury car is. Just a few weeks ago my uncle test drove a Genesis and traded his RX330 for it:
There are also three Azeras in the family so you can say we're converts. Hyundai is no longer a compromise -- it's the real deal. You hear all the good talk about them because it's true, and usually it's coming from a former skeptic.