I’ve been using iOS 26, iPad 26, and MacOs 26 since the initial developer betas and it’s perfectly fine and perfectly usable for me. I like it well enough that I would prefer not going back at this point. I downloaded the 26.1 beta today, flipped off all the standard settings to minimize the Liquid Glass effects. It’s not exactly the iOS 18 experience, buts close enough. After 15 minutes I put them all back, I prefer the Liquid Glass. Everything is subjective.
Frankly, every time there is any sort of UI change on any public platform be it OS, site, or popular app, there are always detractors until they get used to it. Then they complain a few years later when the UI they complained about and ultimately adopted gets changed again.