Siri can read your texts to you. Siri can send you an email or text (to remind you to do something). Siri can schedule appointments in your calendar, make phone calls for you. Help you find your way home or other places, and locate restaurants.
It's a good idea to learn more about the tools we use everyday....and paying a lot of money for. Here are a couple of articles to read Siri tricks and 10 Siri Tricks to make you more Productive.
I have definitely had problems with Siri but the more you use it the better it gets. When Siri pronounces a name wrong you can correct it. There is trial and error and best to practice using it in your home, not while your driving. That could be a prescription for Road Rage.
Technology the more we research our tools the better.