Shortly: less cooking battles and exciting goodness but more bad parenting and backhanded methods.
After the brilliant first season and great second season this season left me wanting more. At the beginning the Moon Festival feels like padding without any excitement which the prequels were filled with.
The plot (very) slowly begins towards the end with the main villain introduced.
If you absolutely loved the first and second season and can't wait to get more then give this a chance but otherwise i'd say this is by far the weakest point of the series.