Things I use it for with almost 100% accuracy: Timers, Alarms, Lights, Pausing/Playing TV.

Things I use it for with like 70% accuracy: Weather and anything interfacing with maps. To be entirely fair to it though, I live in a non-English speaking country and use voice assistants in English usually, so city/place names REALLY throw it. If I change the voice assistant to my local language and use it, it works a lot better.

I have honestly never tried setting a reminder because my brain is still rooted in early voice control tech where something like that would never conceivably work.