Siri was wonderful five years ago or so but the digital assistant scene has grown and the competition hasn't been resting. Its a disappointment now. Whenever Apple announces some improvements they are only marginal or novelties like now with more sass!
It has a long way to go in terms of better feature ubiquity, contextual interpretation, etc but I think my biggest headaches are just with simple phrase recognition. I enunciate fine and it hears whole sentences I didn't even say. Sometimes I have to talk like a loud robot to have my commands captured correctly and having to resort to that just makes a digital assistant pointless, so I seldom use Siri anymore and disabled it on my new AirPods too.
Google's voice recognition is insane! I don't own any Google products so my only taste of it is through voice searches on the Youtube iOS app but its on point every single time. I don't need to talk like an automaton at max volume and I can throw the most obscure keywords at it and it almost always knows what I'm looking for.