@GrahamCrackerLackin- Welcome to the boards! I got married in Jamaica during a cruise on Royal Caribbean in April 2016. There is definitely pros and cons to a cruise wedding, but we would do it again without hesitation!
There is still a lot of planning and work that goes into a cruise wedding. We did the ceremony in Jamaica and used a Jamaican wedding coordinator. I was happy with this decision because it allowed me to work with her to plan the ceremony for the year prior. This is compared to working with a random person in the wedding department of the cruise line prior to the cruise and not being able to do much planning until the month or two prior to the cruise, then working with a different person once you get on the cruise.
As far as guest reactions, we had an overall good response. Most people who didn't come would not have come to a destination wedding in Mexico due to not having the finances or able to take off enough time. The only difference the cruise made for us was that women could not be more than 24 weeks pregnant. This rule caused at least 3 couples to back out because they would be too far in the pregnancy. If we had done a destination wedding, they could have come, although they still might not have felt comfortable traveling that late in their pregnancy.
Here is a link to my planning thread, which might be helpful: http://www.bestdesti...d/#entry1904615
Feel free to send me any questions you have about planning a cruise wedding. Good luck!