The ripples drive me crazy. Everytime I click a button my mind gets yanked into "what just went wrong?" because of the inconsistent nature of the ripples. Even though I know it's going to happen.

At times it feels like a Flash site from 15 years ago--too much animation and it can be really heavy-handed.

I dislike the abundance of color schemes with low saturation. This lower contrast, and I can imagine I'd have to turn up screen backlight to the max if I used it in sunlight.

I tried to use colleague's android and I found it unintuitive to use too (it wasn't obvious what elements you can interact with, and animations were annoying).

(I'm a WP user and it's THE UI I like best.)

It's like saying in a Windows 10 thread you dislike the MetroUI/ModernUI design.

I prefer the material design in Android 5+. And I like the iOS 7+ design and Win7 Aero design. But I cannot live with the ModernUI of Win8/XboxOne - who choose those ugly colors?

I think we need to be careful of treating Material as an all encompassing solution. A lot of UI / UX folks I know are full on embracing it without taking a step back and seriously evaluating what problems it will and won't solve. I'm not saying I dislike it, I just think that there are different solutions for different situations. There is no silver bullet in our industry.