The refs seem especially bad this year in general. It seems like almost every play an offensive tackle is holding and edge rusher around the neck without any call. It doesn't seem to matter what game ... they are all the same ... until that one big play that happens and the refs throw a flag for the tackle holding the edge rusher.
OPI and DPI seem to be subjective to whatever time we are in the game. In the Steeler game Detroit fans complaining about the last 2 OPI calls in the game. They were penalties, although there were a lot worse one that happened throughout the game that were not called. However, they forget the 4th and 2 DPI call earlier in that drive that was called. Yes, it was DPI, but barely and there were worse calls throughout the game that were not called.
The DPI on the Ravens that WASN'T called in the Patriots game is another example of the missed calls that have been happening this year. It has been equally bad for all teams. It is a shame ... or is it the NFL's way of ushering in the calls "from the booth" so the on field refs don't have to do anything but what New York tells them to do? They could cut the officiating force down to one person with a headset ... hmmmmm