Whenever a Mopar Hemi engine gets a lot of attention, be it the Hellcat, the 392 or the 5.7 this crap gets trotted out. I know I am speaking in broad terms but generally I have found that it's the people who feel threatened, personally for some reason, by new engines. They seem to follow in the following categories:
1: Chevrolet or Ford brand loyalists and fanatics.
2: First and second generation Hemi owners who are offended that an affordable Hemi engine is available to the general public and can buy into the "elite".
3: Technological dinosaurs who believe that v8s should all still be related to the RB, Commando and Magnum series.
Does it shares some technical similarities to the Chevrolet LS generation of motors? Perhaps, but that isn't a bad thing, the LS motors are extremely impressive powerplants.
Do the Gen III Hemi Motors have absolutely strict hemisphere chambers? No, they have a modified hemispherical combustion chamber optimized for fuel burn and exhaust flow. They still utilize 2 plugs per cylinder and share many other design elements with the elephant motor.
The motors are an improved, updated, refined and worthy successor to the Hemi name. Is it a slavish downsizing of the 426? of course not, it would be down on power and wouldn't pass economy even if it was.
the new 392 for the 2015 model year is down only 20 horsepower from the LS7 with over a half liter deficit, that says a lot about the new Hemi