Not only is the Challenger perhaps the most attractive muscle car in 30+ years, it's one of the most attractive cars in its price range and I'd even say it's more attractive than 90% of modern cars in any price range. Further, it offers a very good build quality in general, and in its price point and class it's among the quickest and fastest. Taking the 392, there's not a lot of cars that can actually beat it in quickness or speed. I bet there's only a handful of production cars in my entire zip code that would be demonstrably faster, and you'd probably have to get into big money or mods to make that happen.
Posted numbers for the 1970 440 6 pack legendary car, are slightly slower than a 392. But the 392 is far more practical, fuel efficient, handles better, and is worlds safer.
The 392 is still a useful car with decent fuel economy, rather than a gas monster made for sprints. Pre- 1975, it would have taken a massive engine and probably mods, a car impractical for the streets, or sportscars and supercars to post 392 quickness and speed. Almost nothing outside of racecars or supercars could perform 392 numbers from 75 to 2010. So in the last decade, it's again down to very light track cars, racecars, and supercars or high end luxury cars and now EVs.
"All show and no go" Really?
So I'm not really sure what you're comparing it to. Supercars? Mythical cars? EVs? Cars costing twice as much?