I have purchased some stuff that tastes vile tbh. Some nice surprises as well though. I don't have time or location to do what you do.
I can't see how people can do a weekly shop in those stores. It's very limited in my opinion.
Lidl and Aldi philosophy is shop their for essentials elsewhere for extras.I shop their then use Marks or Waitrose and independent butchers and greengrocers, you can save money once you understand their product range.