OK that's the exact opposite which in my opinion is exaggerated. In general there are lots of games where multi is very fun and should exist. However I don't like:
1) Multi with Horror, as I explained
above it doesn't really work as intended.
2) Single player game series that add multi at some point and ruin all the actual story experience. When I hear the developer of a previously single player game say "for our next game we are mainly focusing on multiplayer" or "first we are building the multiplayer" I immediately know that the result will not be worthy of the previous games. The only exception to his rule, in my personal experience, is Assasins Creed series which continued to have a rich story.