I really enjoy her writing. I find her v intelligent.
I don't think she is very comfortable on tv though and so it comes across as very artificial.
I think she has been badly advised by her producers too. Pretending to be "normal" and "down to earth" when she lives and works in very high 'falutin circles and lives in a designer house etc just doesn't come across well. She isn't like the rest of us (good luck to her!) and she therefore shouldn't pretend that she is!
I agree with others about the maniacal smiling though I'm afraid! '[Yes we know you love cooking, but it's not necessary to constantly grin at the mixing bowl or chopping board to get that point across!]
Above all though, I think the main problem with this series is that it just doesn't offer anything particularly new or original - the content is lacking - which was the saving grace of previous series.
And agree with others that the concept seems very woolly - is it health food, easy food, Middle Eastern food or what?
And the bits at the end come across as very contrived - which is the opposite of what she was trying to portray I think - a bit toe-curling.
Feel very disloyal posting all of that though because in general I'm a big fan. But she has been through some hideous things in the past couple of years so will forgive her for now! 
Over and out and barky shards to all 