Back in the day single player gameplay was what would make or break a game. As time marched on there was a call out for the need to add another player to the game to add some fun and to allow players to perfect their skill of the game.
Single player gave way to multilplayer. Multiplayer now allowed at least 2 or more players to be playing the game at the same time. Multiplayer enhanced the game and single player did not suffer. But multiplayer was not enough more was what many gamers wanted.
Multiplayer then expanded into online play. Online play now allowed players to face off against a multitude of other players. You could have your classic 1 VS 1 battles. Or you could go all out and battle against more then 2 other players.
Online play has now become the most important part of most games. This of course is a good thing for some people but it has come at a price. Single player mode is now being neglected in many games. A few hastily tossed in levels to learn the basics of the game.
I am an online player myself. But I am sadden when I buy a game that is suppose to be a great game online only to find out that the single player mode is weak. Being online and battling out with others is great. But there are times when I just want to sit back and enjoy a nice quiet game by myself.