Our cameras do a decent job of picking up sound (better than from a phone), but they are limited. We send a voice recorder to keep near officiant and bridal couple during vows (in the groom's pocket is a great spot). For the toasts, we recommend setting up the voice recorder at the head table or podium where speeches will be given.
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.