I have made some lovely Yotam recipes out of the Guardian, and I think there are some things he is great at. Kind of fussy, complicated but delicious things that you make for a special occasion or when you have spare time.
However I went off him a bit when I read about him having a child (aww) and in the article he was really rude and patronising about a lesbian couple he met as part of the process (boo). So I can't see this Mary Berry-dissing without thinking that maybe he's just a leetle bit upset about a woman having all the kudos she has.
She btw is a genius, especially if you have an Aga thrust upon you like we did (came with house, Mary Berry's Aga book has made me an Aga supremo).
As for authenticity, tish and pish. I can't stand it when people fuss about whether it's authentic and like what they do in some country of origin. I'm not Italian, so why does it matter how or when I have a cappuccino? I'm not Indian or Israeli or Mexican, and I will do what I like with their food, and vice versa I'm sure. You don't create a great national dish like chicken tikka masala by getting po-faced about being authentic.