An interior feel/vibe is not something you can accurately judge by looking at pictures on the internet (even then your chosen picture hardly makes the interior seem fantastic)
Get in a Bentley Mulssane or Rolls Royce Phantom and there is no denying that you've got into a very, very special car. Get into an Audi R8 and there is no denying that you've just got into an Audi. As far as I am concerned that just isn't acceptable for a car easily into the six figures bracket.
It's why a Flying Spur feels special and a A8 in compassion feels like an overgrown minicab despite them sharing a lot of components. The difference is that the A8 feels like an Audi and the Bentley feels special.
WUT? You comparing a supercar to a Bently? Right ok makes sense?

And FYI I visit Leeds Audi quite a bit and yep you guessed it they have various R8's and I have so happened to see feel and touch one, shock horror.
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- I feel the R8 was designed to give a halo effect over the rest of the Audi range, essentially a car built with one eye on the marketing and brand image influence, equally as much as it was intended to be brilliant drivers car in its own right to compete with Ferrari and Porsche. 