I couldn't disagree more, but I get where he is coming from.
Maybe I am not that much of a gamer at all any more... but for me single player games are just like movies and books; I try to find the time to enjoy the spectacular ones (that means the one great out of a thousand!) but I completely pass on the rest.
This is due to a lack of time, but also to a personal sense that ultimately it is a waste of time.
So this is where multi-player games come in... sometimes you just want to "waste" some time (lets say an hour or so), and getting into a single-player game for such a short time just isn't very enjoyable. Hence I stick to online mayhem

The only other time I play are those rare occasions where I meet with friend for a LAN, and that of course also means multi-player games... but often only the old tried and true classics.