It was always going to be difficult to turn it round after the way it began 
I didn't realise till Thunderbolts linked it on Mary's blog, but Mary had posted again on the 'Mary Beard is marvellous' thread from when her Pompeii programme was on:
'marybeard Fri 11-Nov-11 20:24:22
This is such a long time ago... and I was so pleased that you all gave me the extra confidence. Thank you. I have got a little bit of a dig back at AA Gill (in a self ironic kind of way). Hope you half approve.. a bit worried about what you might think about the Miss World line.. but lets see!'
I wouldn't have expected this - even when someone has been on MN in the past, the more they hang out with Jamie Oliver and what have you, the less it crosses your mind they might actually care what you think, let alone be waiting for a response.
But given that they do, you can't expect them to have an infinite capacity to rise above, any more than anyone else has.