>>297188Ducks are filthy, but I raise them outdoors on pasture and their coop has deep bedding so they aren't as gross as you think if you have the land.
As far as difficulty goes, I find them pretty easy. As previously stated, I have land, so the mess isn't bad. The ducks are raised for eggs. They lay about as much as chickens, and I like duck eggs more than chicken eggs. I sell the excess eggs and keep the rejects for myself (misshapen, hairline cracks, etc.)
If you live somewhere where water is expensive, DO NOT get ducks. They are very thirsty animals and waters need to be cleaned daily.