oddly enough your post hit a mark, immersion appears to be a single player game. and i would agree to that aswell, once you bring in the human element you can say good by to immersion unless you play with Role players who like to keep in charactor. once you bring in that human element it may aswell be a Call of Duty online match. with other players informing you of how well your mother perfomed the previous night and that you probably come from Africa.
Immersion is when you dont have to deal with other people breaking that immersion,
I think that sums it up for me as well. It's why I've played games like Final Fantasy 7-10, but completely avoided games like Final Fantasy 11 and 14.
Nothing worse than you being in a game world and someone coming along and going "LOL GG" to blow your escape from reality out of the water.