[pluma]

I'd disagree. I like some of the Material related changes to Google Maps, for example, others seem like they were only done for consistency's sake with no benefit to Google Maps UX. Also IMO they managed to make YouTube even worse with the recent attempts to shoehorn it into their Material design.

The problem with a unified design language is you end up with the lowest common denominator for vastly different products. Material works great for Google Now, somewhat okay for Google Maps, pretty meh for GMail and terribly for YouTube. But that's just, like, my opinion, man.