One thing that Google Home does noticeably poorly with is disabled voices and non-native speakers. Google Home would be really handy for a family member with down syndrome who can't read nor write but can easily learn voice commands, but Google Home doesn't currently understand him at all. My partner with a Malaysian Chinese accent also really struggles to use Google Home.
That said, I notice the quality of voice recognition is rapidly improving and I'm thankful for the work the Google engineering team are doing; voice recognition and language translation has the potential to improve the lives of so many people.