I think in the past some supermarkets own brands have been ok, But now with the credit crunch and obviously people having to watch their spending, suppliers and supermarkets will just put whatever ingredients or quantity/quality of iingredients in carte blanche.
Even in good quality food ( or what we perceive as good quality ) it is surprsing the % of ingredients. Sausages can be 75% pork- the rest just bulk to make the weight up. Fish is another one, Due to the recent weather i went to buy some frozen fish – haddock – % of hadock 53% the rest again just water and bulk and that was a reputable frozen food brand. I find that I check the ingedients now. Thats when I can read them ,I think they print them so small that we can hardly read them.