Yes, when combined with a wide assortment of "extensions", gnome-tweak-tool can make Gnome 3 almost tolerable. People with little experience or limited needs probably wouldn't notice anything wrong.
Gnome is openly aiming at people who don't use their computer for much, like those making cars for people who don't drive, kitchens for people who don't cook, boats for people who don't sail, and books for people who don't read. There are many more of those people than of the rest, and collectively they have lots more money. The problem is that when you make the perfect system for them, they won't find it, because they can't be bothered to look. If they do happen across it, they won't tell anybody, because they won't notice.