The pass interference when resulted in the Raven's only score was pretty bad. Very little contact, crummy pass. The Ravens' LT has been holding badly on just about every other pass play, and I don't think it's been called yet. The roughing the kicker penalty was beyond awful, obviously, but it's not like it's only going one way.
Man the Steelers are getting away with a lot. There was a blatant hold on their last first down run and that was offensive pass interference in the end zone that should have resulted in a Ravens' interception.
Both teams are holding like crazy, which I guess is to be expected with two defenses like this. If they called it the way it's being played on the field, this game would probably still be scoreless because both teams would be looking at 1st and 30 on almost every drive.