Our cameras do a decent job of picking up sound (better than from a phone), but they are limited. We suggest making sure the person with the camera is close to a speaker. Check out our blog and you'll see a lot of different samples.
We've had lots of couples with outdoor weddings and sometimes the ceremony is picked up, sometimes not as much. It really depends on a lot of factors, but if you check out our cameras how to we do give you best practices to get the best sound you can.