I just recently learned that it is a faux pas to say "enjoy your meal", at least when you believe in social etiquette. Apparently by saying it you are questioning the quality of the food, or at least implying that the meal might not be good
So if you can't wish your fellow table mates a good meal, what are you supposed to say when you start eating? I can't imagine that it is good practice to just start eating.
Following the same etiquette, you can also not say that the wine is good. That would be insulting to the person that picked the wine, since it should be a give that the sommelier (or whoever took care of the wine) presented a good one.