It is obviously a matter of taste and preference, and to each his or her own. For table grapes, many prefer American grapes.
For wine, it is a different story. Some hybrids are OK, some are good, but none really shine the way some European grapes do. There is no hybrid that can rival a cabernet or chardonnay for popularity among the world's wine drinkers. It may find a niche market among those familiar with it, but they cannot stand up to head to head competition for the vast majority of people.
You are correct. Taste and preference are such variable things.
Even with European grapes, though, I prefer those of the Mosel/Saar region. Nothing can come close to the Bacchus, as I said. But their other traditional offerings -- especially in the auslese and spatlese varieties -- are more to my liking. Rieslings, Sheurebe, Müller-Thurgau, Kerner.
I was surprised when I came home after my 2nd tour in Germany and decided that I like the American's better. But, then again, I do like wine fruitier and sweeter.