Seedless grapes and seedless watermelon in the USA are terrible in my opinion. I think anyone who likes them has never tasted really good grapes or really good watermelons. I think that is true of most Americans. The old fashioned types of grapes and watermelons are rapidly disappearing. Even small seeded watermelons are not as good tasting as watermelons with large seeds.
About grapes. Last week, I was walking home from school through a different exit, and i found a wild grape vine, loaded with fruit. I tried one of the grapes. It was seeded, of course, and very sour, but in a good way. I actually couldn't stop eating them. I collected a bunch of seeds, i plan on starting some sort of selection for nice, sour tasting grapes. But now thinking about commercial grapes, it just seems strange, they are all the same. If they are sour, it's not really a pleasant sort of sour. We lost all this unique, readily available (remember, this was growing wild right next to my school!!!!!!) diversity, just to mass produce a product.
I recently read "lost crops of the incas," fascinating book, amazing resource, and again, it highlights the diversity we miss out on because we desire a seedless fruit or two.