One thing people have seen quite often in recent years in the releases of games is the lack of a story mode. Games such as Titanfall ditched the single player narrative for a multiplayer narrative mode which didn’t work in all honesty but even when games do have a story, the developers often phone it in with a half assed plot in favour of multiplayer mechanics, see Halo 5 for an example. This hasn’t really happened to any other genre other than the common shooter. You could class MOBAs if you want but they can never sustain a single player experience due to the design so they don’t really count. You're here to see the pros and cons of single player only games to multiplayer only games to mathematically calculate which is ‘better’. Of course calling something better than the other is always non-objective so take this with a grain of salt if you will.