It's implementation was poor. It had trouble with accents and general accuracy. Siri launched with no such problems. I had an android phone in the early days of android voice recognition. It was crap. Around that same time few aspects of android seemed to work as smoothly and flawlessly as equivalent functions in iOS. I know because I had an ipad at the same time. You can stop waiting because I'm telling you exactly what you want to know. If Siri isn't enough for you, you can almost pick any feature that android and iOS are both capable of. When apple released their version it was more polished than when android released theirs. I'm not saying android is bad here. Their approach is just different. They throw out early versions of things that may not be quite ready for prime time and keep what works well.
Android device manufacturers have followed much the same philosophy; loading devices with every possible feature they could cram into them, making them in every size feasible, using a wide range of different internal components. All that is throwing stuff at the wall and seeing what would stick. Guess what though? At this time the better device makers pretty much have figured out what would stick, and improved it to the point of usability. That's why android always has the latest new thing months or years before apple does. Apple takes a much more measured approach, and it shows in the quality of the features they ultimately include.