Breeland didn't play that bad IMHO. He was on an "island" much of the time. How many guys can stop Brown and Ben with the coverage the 'skins' threw at 'em? Hell, one of the TDs the 'skins had 9 or 10 in the box to stop the run.
Breeland wasn't that bad. He went up against elite talent without the benefit of a pass rush. No CB, no matter how great he may be, can cover for extended periods of time and especially when he's going up against probably the best WR in football and an elite QB. The team was not well prepared across the board. When pittsburgh went for the 4th and 1 I told my brother what the play was going to be and yet D'Angelo Hall was still caught taking a step inside looking for the run and wasn't able to get back to help deep. Breeland was right there on the play but the pass and catch were exceptional.
The biggest culprit of the loss was Kirk Cousins. He was utter crap early on and set the tone for what took place. This game was about the QB's. Brown is great but it's Roethlisberger who makes him what he is. Roethlisberger is just an elite talent and Cousins is not. Cousins showed no pocket presence and looked lost against the steelers defense and was looking to get rid of the ball as soon as possible by dumping the ball off on short routes. He looked like a deer in the headlights and was often stepping backwards instead of looking to step up into the pocket to make good reads and good throws. The first interception he threw was the exact same play that got him benched in 2014 against Tennessee. Two years later and he still got fooled by the same coverage.
There was also a throw on 3rd down where he clearly threw the ball away to avoid throwing another pick when he wasn't even getting rushed.
contrast that with the fearless and supremely confident way Roethlisberger plays and you see why the game ended the way it did.