Given there seems to be no benefit to being host on PS4 anymore, I must admit, I've suspected a fair few people of using lag switches. It's marked in some matches, when the slow-mo kicks in. It's almost always as, say, someone tries inputting Jann Lee's unblockable, or Ryu's tele slam.
But all I usually come across in ranked is mashers anyway. And I usually get bodied by lag. And when I say lag, I mean LAG. Unplayable, I am sure you've experienced something like that... Sucks...