Not to defend Flacco (or any Raven for that matter), but IMO, he isn't the reason the Ravens lost to Pittsburgh. OK, the botched snap seemed to be his fault from all the angles I saw. But, how many times did his receivers let him down? He put it right on Boldin's hands in the EZ for a sure TD that was dropped. Pretty sure the generally reliable Mason had one drop and even that final play, 4th and a mile pass hit Douchey right in his paws.
You're forgetting about the interception, which was a horrible read and a worse throw. Let us right back in the game.
I'd grade Flacco a C- for the game, and the WR's get an F.