Can we stop with the Netrebko=Callas? Like, immediately? I can't begin to understand this comparison except as a bit of wishful thinking: we'd all love to have an epoch-making diva.
Netrebko is a singer to be reckoned with. She's hot stuff onstage and off, and yes, off does matter--making a splash is the difference between an artist and a star. Who knows which one she wants to be eventually...She's more a star at present, albeit a star with fantastic theatrical instincts and a lot to work with in the chords.
But where to start? 1) She could never, ever sing Brunnhilde, or Isolde and if she's got a Norma up her couture sleeve, it's many years down the pike (though honestly, the rhetoric around Norma does get a little hard to wade through--mortals have made their way through it and even sung parts of it well.) Fine, Callas might well have sucked as Lyudmila. 2) She (Trebko? Net, spasibo) didn't have to totally overhaul herself to be (conventionally) hot; she was already there. 3) The florid technique is just not remotely as fine tuned chez la Russe as chez la Grecque 4) Her public persona is rather straightforward and conventional, no champagne vs. Coca Cola remarks, no running off with famous people, though I guess there's still time, but she just doesn't seem like she's going to die alone, mysteriously, in an apartment in Paris. Etc., und so weiter, i tak dalee...
Most importantly, though, her acting is more physical than vocal. That is the main way in which she is not Callas.
Anyway wouldn't it be more fun to call her The Cossack Callas than The Russian Callas? She's from Krasnodar. It's Cossack Country. I googled it.