I know exactly what you mean OP. There is often a specific 'freezer' flavour to foods that have been cooked & frozen. I hate it.
I'm not sure what causes it, and whether there's a discernable difference between using freezer bags or foil trays or tupperware type trays
I don't bother much now after too many disappointments.
I cook double quantities of several meals each week & we eat it over 2 nights & it's stored in the fridge - curry, chilli, stew, bourguignon, lasagne, ragu etc
Then we only have to cook the sides fresh daily.
The other nights we have quick meals like stir fry, salmon, omelette etc
I think some people just don't notice the freezer taste as I've also noticed it in food from family & friends.