As Teeqoz said, it's just a disappointing trend that is making more and more developers comfortable with not putting in the effort to provide a single player experience.
Really, it never bothers me when some new franchise is exclusively multiplayer... the only time I'm bothered is when it's a new installment in a franchise that I used to love to play single player. Easily the most obvious recent example for me is Battlefront, which was just terribly disappointing and, unsurprisingly, grew old within a couple days.
Otherwise, the trend goes hand in hand with the decline in quality coop campaigns. It seems like developers are realizing features that were once a given in games can today be skipped while still selling just fine.







