H,
Agreed a 'real DB5' would not have withstood an attack by a feather duster (BTDT!).. but James Bond's DB5 is different... the windscreen was armoured...and I think the front was as well (we know about the rising rear bullet screen..).
So all in all very
accurate...
You know I think I'll have to watch all those early ones again
(damn... its tough but somebody has to do it...I know htere are those who can give me chapter and verse already....however first hand research is always needed

)
They did trash a few DBSes, let alone the Alfas (including a driver I believe)...however the majority of the stunt Vanquishes in the previous iteration (on the ice) were not Astons...
All that said I felt we were treated to too much of JB's baggage....we know he's a dark soul...that much is clear from the first film...it is part of the appeal...the unknown, the mysterious. Bringing light to bear on it lifts that veil and somehow diminishes the mystique.
Mind you Sam Mendes is a very different sort of Director....so it does all fit together in its own way.