Player 1 is level 5 and just started.
Player 2 is level 53 and has finished every quest.
Player 2 has just given player 1 full Daedric Armour, 10,000 gold, and every key there is. Before you spout THIS CAN BE DONE WITH THE CONSOLE, it only backs up my point that the PC allows too many options for cheating. Also, player 2 could kill everyone in player 1's world. This would also cause a problem with mixing worlds since many people would be dead/alive depending on how the other players chose to play the story.
What if player 2 took an item that player 1 needed to complete a quest, or killed important characters?
That's why you only play with friends, many games (That I can't think of at the moment) have level scaling so if you join at level 50 into a game with a level 5 you'll be level 7 or whatever. What about Borderlands? They didn't have a problem with level 5 and 50s being together, because nobody does it and it takes the fun out. If this game is about freedom you should be allowed to do this.
Just have a level scaling, main character and a safety mode. Like Fable. The game works out pretty well that way and is an option.
I don't think it would break the game, but no elder scrolls has had any multiplayer and to expect it would be stupid.
I prefer single player games anyway. I wouldn't want to play this with anyone else. When I play an RPG I actually roleplay. I walk around towns visit friends and live in a house.
I'm especially excited that you can marry people in this game.
I don't buy anything without multiplayer until it's under 40 dollars, it's a new engine so I expected multiplayer because it's in everything, expect it everywhere in the future.
I wouldn't even like a game like this to have multiplayer
Not all games have to have it. This is one of those games where even if your internet goes out, it doesn't matter and is therefore the best game to play in that situation 8)
Besides I was perfectly content with Morrowind not having it, or Oblivion, or Fallout 3, or FNV.
Why not have multiplayer optional, so you CAN play single player or Multiplayer, like every other game with multiplayer.