I agree with you that homemade many times are better tasting, and that homemade hamburgers taste better than McDonalds. So I don't feel brainwashed... But homemade is not always the same as better. There is a lot of bad food out there (in the stores) just waiting for me and you to buy. On example of bad food is the "English Mad Cow Disease" infected beef (problem in Europe), that comes from feeding the cows carcases (I think I used the right word). Another example is beef with traces of antibiotics, caused by "unserious" breeding.
I try to, when I have a choice, to buy biodynamic food, beef from happy cows, etc. It is more expensive, but (in my opinion) better.