there is nothing great about sliced bread

Most of us have heard the phrase "greatest thing since sliced bread". It's been around since 1920s. Generations grew up with that phrase embedded in their subconscious, and as a result most of the bread that is sold in the United States today is sliced. Also, my personal opinion, is that most of the bread that is sold in the United States is terrible.

I always hunt for a good loaf of bread, and I always ask it to be not sliced, because sliced bread dries up much quicker. I also like to control the thickness of my slice, depending on what I am eating it with.

I believe that the only "great" thing about sliced bread is for makers of bread slicers.

What else in our lives is a result of clever marketing and is not actually that good?