Why is there a bias against MP only games?

[hershel_layton]

Goatseye said:

Gamers on internet have a bias against MP only games. Although a minority, they're a good size of forum dwellers.

Some of the justification are that:

 

1.   there's not enough content to justify a $60 tag, 
2.   there is no story or some form of campaign, 
3.   they're mostly aimed at dudebros
4.   etc,...

Give me some argument for and against these type of games. And if you can find arguments against single player only games, drop it here.

 

Depends on the game. I'd be bummed if a game like Mario Kart was only multiplayer, and I'd be bummed if a game like halo was only single player. It truly depends on whether a multiplayer/single player option is going to improve the game and be a nice addition