<The Meg>
While the Megalodon is a neat addition to the game, it's seemingly very common.
During each trip back to the Ancient Spire Outpost from the Forsaken Shores there seemed to be a meg that showed up to bite my boat a couple times.
During the skeleton ship battles, they showed almost every time. For being such a rare creature they show up frequently and at the most inconvenient time. They aren't as exciting as or eventful as they used to be. Each time I see one now it's a long "UGH"Either because now they're a waste of supplies and have no rewards. The only way to get them off of you is to kill them and they bring an army of sharks with them in the water as well.