On desktop there is tons of wasted space, key actions are generally hidden behind pointless hidden menus or silly + buttons that do multiple things even though there's loads of space to fit multiple buttons. Google Drive, Sheets, etc. are total jokes now. And I personally find Google play music is an incredibly bad user experience now for my habits. I like listening to my thumbs up playlist (unnecessarily hidden behind a slide out menu) and I like seeing my shuffle playlist (hidden behind a button that opens an idiotic floating modal).
On mobile, everything is too spaced out so you can only see 5 out of the 50 things you might need to actually see. A perfect example is the calendar which is an unusable joke compared to the old one. Another good example is the new clock app where the alarms only show 3, and the timers are bizarrely stacked with only a tiny indicator showing there are multiple timers running.
Material is a tablet design paradigm masquerading as a total solution.