kai2: Co-op may be slightly different, since teamwork can be done in the context of a story (goal), but even that leaves me a bit non-plused.
So as I look back on years of mulitplayer, I start to wonder if there was a point to it all?
Throughout the years, I've played multiplayer/co-op with friends and family (long term friends, cousins and more recently my wife).
It is different when you play with loved ones, especially in person. It is a bonding experience that might be missing if you just play with strangers on the internet, unless you regularly play with the same group of people and they become friends of sorts (I've had that experience with the Utopia browser game, though I had to give it up after about a decade playing the game, because I couldn't invest the time anymore, but I played with some of those people for a decade or so, same people).
Gaming can be about endless rounds of competition with whoever for bragging rights, but it can also be a genuine social experience.