I don't think that being mid-engined and/or obnoxious-looking are necessarily requisite attributes for a supercar.
I never said it had to be mid-engine. However, looks are a big part of supercars.
Aston Martin's look is universal through every car.
It sure doesn't hurt - I think the modern Lamborghinis look amazing and fit the supercar ALMOST bill as well as the Aston-Martin - but there's more to it then that. Plenty of supercars are front-engined: the Viper, Corvette ZR1, GT-R Spec V, ASTON-MARTINS

, certain Ferraris, etc.
You think Lamborghini is almost as much a supercar as Aston Martin?
In the looks department, I bet you any money that the Aston-Martin DBS will age 20x better than the Murcielago or the Revention. Subtle, sensuous curves win out over wedges every time. The Miura? Curvy. The 250 GTO? Also curvy. Same goes with the Astons - they win 'best-dressed' no matter which company they're in. When people look at a Countach or something like that, it looks like an old car. Your Miura, much like the Astons, carries their age much more gracefully.
Aston Martin & looks is a laughable argument; they're all designed the same. Don't believe me? Look at the Virage & the DB9. Laziness at it's finest. They won't age well if they can't keep the design fresh between models. That's why Lamborghini's look so old; because 1 model stays around for over 10 years & is just updated over time.
But, that's due to money & the age each Lamborghini is built in. To have a design that makes people stop & look, you have to design something outside the box. Over time though, that design is no longer "out-there" because as time goes on, the world of design changes as well.
Things like that are the key to updating 'the formula' if you ask me.
You can't update something if you aren't building anything like it in the first place.
Aston Martin has not "updated" what made the Miura a supercar. They have gone their own path & created grand tourers.
Lamborghini has gone their own unique way
How can Lamborghini go a "unique" way if their way is still true to the original concept?
Long story short: More customers than ever before nowadays want a
luxurious grand tourer that comes with enough power to blast across continents with ease as opposed to brutal performance.
Aston-Martin (and Mercedes and Jaguar as well) represents the best modern interpretation of the formula. The supercar is evolving, and cars like the Lamborghini are no longer the bread and butter, I think.
Just my ramblings though!
Thank you for just shooting your argument in the foot by saying people want a luxurious
grand tourer & Aston Martin is the one doing it whilst Lamborghini isn't.
As for who is the bread & butter of supercars, Lamborghini & Pagani remain true to the Miura. Supercars were
not about being luxurious & driving through continents with ease (bar the Veyron). That's what the grand tourer is for. The only reason a supercar can do those things now is because people now-a-days feel they should be given creature comforts to make their drives easier. In the case of Lamborghini though, it's still a difficult task because of their width.
Besides maybe the One-77, Aston Martin hasn't built anything that could be really seen as a supercar (in the same sense as the Miura) since the F50 besides perhaps the Vantage LeMans.