Hmm, my experience with Siri is that it's good for setting timers, okay at setting reminders, and that's about it.

Even reminders is pretty bad:

"Hey Siri, add celery to the shopping list" "Okay John, I've added celery to the shopping list list (sic)."

Shopping list: - Celery

"Hey Siri, remove celery from the shopping list" "Okay John, I've added celery to the shopping list list."

Shopping list: - Celery - Celery

This is not meeting expectations.