I like single-player gaming more than online gaming as well, but I won't say it's 'superior' since it's all subjective. I'm sure there are millions that disagree with me, that does not make their philosophy wrong though.
I never preferred online gaming over single player gaming, but my love for multiplayer gaming has reached an all-time low. My diminished love for online gaming could be attributed to 1.) reaction-based multiplayer games, and 2.) the realization that my enjoyment of an online game is almost completely dependent upon how well I perform.
Today's online games don't seem to require much thinking or skill from what I've seen. Take a game like Call of Duty for example. In essence, the gameplay consists of the player making reactions. That's how deep the game is. And the outcome of the game is mainly based on how fast & accurately you shoot. Just a frag fest.
Another thing that I hate in today's multiplayer games is the spontaneous spawning. With this used, a player can work really hard and progressed his way into the enemy's base (which is can be a very rewarding experience), only to be killed from the back by someone who just spawned. This promotes players to randomly run around the map in circles to avoid being caught from the back. This erases all reward for managing to fight your way into enemy territory. Games without spontaneous spawning are lot more enjoyable for me.
An ideal online game would be Socom PSP/PS2 imo. There was no spontaneous spawning, you successfully take a trail to the enemy's base without worry of being shot in the back. You knew that you did well by getting into the enemy's base (espescially if unnoticed) and then you could take them out. With a system like this, you know that if someone shot you in the back, it was because they skillfully maneuvered behind you, not because they spawned there.
I also moved away from online gaming because I've noticed that I only enjoy games when I win. It's a shame really. I can go from hating a game to loving it in a few hours if I start winning.