When i started the game I played as pirate with a complete raft base with catapult on top to raid other rafts and beach bases. It was the most fun i ever had in ark. Back then people traveled the ocean with megalodons, sarcos and spinos so there was a risk of getting a naval ass kicking. It seemed very balanced to me.
I once caught another pirate raft roaming the waters and raiding noobs. I chased them down and murdered them easily with a mosa.
Nowadays i'd never sail a raft or use a mosa, plesio, megalodon or sarco thx to cnidaria, eels and leedicthys. Don't know anyone who would.
Its very clear to me and should be to everyone that the oceans were ruined with those 3 animals.