Originally Posted by
Soulwind
WoW is one of the only MMOs with a fairly solid "moving surfaces" technology, it has had ships and zeppelins since vanilla, and they have only improved with the years. So player-controlled ships in the world are feasible, and I think the idea has a lot of potential.
As for how they interact with the world and other players, I'd say most of what you'd be able to do with your ship would be instanced. Like PvP battles or "fleet scenarios" where there aren't more than a few players and their ships.
In the overworld, you could be able to summon your ship at ports, and then sail around phased out for anyone outside your group, preventing players from crowding the seas, but allowing them to take their friends with them. They'd be quick "group mounts" that you could stand on and leave anywhere, and at the same time, some hub elements could be added, such as a bank, some vendors, the mission table and a few dailies offered by your crew.