Probably the closest mmo you will find to tabletop dnd. Right now they have a promocode DUNGEONCRAWL where you get a ton of pay to play content for free. Would highly recommend checking out

One of my favorite games, if you are looking for a high seas naval combat first person shooter than this is your game. It has a very easy learning curve, you hop right into game, pick a crew to join, board the ship, load cannons and watch for the captains orders. Only cons I can think of is the game is not too popular which means servers are never full.