Adam Voges, flat pitches, and opposition bowling

Disclaimer: my POW is that Adam Voges is a really good player. But he's not 'nearly same as Bradman' good.

As most of you know, Voges now officially has the second highest average in the history of test cricket (>95!). Most of this comes down to an insane streak of getting over 500 runs without being dismissed (mostly against the WI attack on flat pitches). Over the last year, we've seen flat as hell pitches in Australia and dustbowls in India. A century in a 250-200-200-150 match is just as good (all else equal) as a 250 in a 700 plays 700 match.

Given the trends we are seeing in pitches, with certain players playing a significant amount of cricket on flat decks and others playing on minefields, I think we should start trying to account for pitch quality when comparing batsmen. Any ideas on how to do this?