What if you consider the 'platform' google? They've not 'sacrificed', they kept it consistent. No?
Having said that, and speaking as an Android user/developer, I am always annoyed when an Android app I am using is very clearly an iOS port and still retains the iOS look & feel. This annoyance isn't coming from added cognitive burden or a fanboy-type perspective but probably from a design perfectionist/hipster perspective.
It just seems.... rude, I guess, to not follow the local cultural norms (though I do get why it is done for expediency).
They also blown up the huge thumbnails for videos, so you can basically see 2 and half videos on the screen, compared to a much denser list before.
Not to mention the information density on the tablet : http://a3.mzstatic.com/us/r30/Purple69/v4/37/3f/0d/373f0d5d-...
Material design can be pretty nice, but not with horrible wasting of space where Google went completely overboard. This is BAD.