I don't pretend to know your situation so this is only pure speculation...
It is certainly possible that it is purely a personal preference/taste issue and your wife just doesn't like smoked/spiced foods.
It also could be a bit of a power struggle where she disapproves of your hobby or attention to it and she is showing her irritation by being overly critical of the food. I am a bit of a grill fanatic and can tell my wife is irritated if I focus on my hobby a little too much. Again, just spitballing a bit and I don't pretend to know your relationship with your wife.