Google maps was always very buggy for me on Android, but fine on iOS.

Hangouts is bad. Very slow and bloated everywhere. On mobile it only syncs notifications at random. Audio and video quality is total crap, and even with this new web beta thing where it's supposed to be better, it's still much worse than skype.

The most incredible thing, and I am ashamed of typing this but whatever, is that I've actually felt an improvement in my life after turning off hangouts in gmail. WTF.