It just looks disgusting to me, too much like iOS. From lockscreen, to the blur effects, the shape of the icons, their size and arrangement, the way they divide options on holding an icon resembles the 3D touch, the widgets view on the lockscreen and the pin entry, it's too much of imitation. I mean, if I want that, why would I buy a Samsung device. I hated it.
Another thing to point out is the settings button in the quick settings panels, they took it to the top, which de fefets the purpose of one-handedness, which was initially their aim with One UI.