And, like, 100% success or very close to it is fairly standard across the line–if you flip a light switch the light turns on, if you turn a door handle the door opens. When you give someone something complicated and novel and it doesn't even do the thing you say it should do consistently that just tanks confidence in being able to use the thing.
Yes. Yes, it is.
For some reason we're sold on the idea of "good enough" for things that are actually "just barely usable under perfect conditions". And this doesn't apply only to voice assistants.