Through two weeks of action, the NFL's replacement officials have caused an uproar. Quarterback Joe Flacco of the Baltimore Ravens said the refs are "affecting the integrity of the game," which is actually among the nicest things said about the group in the last few days.

REPLAYS

NFL coaches have thrown 29 challenge flags this season—that's on pace to be an 11% increase from last season. While it may seem like this would give referees a very public chance to be exposed, that hasn't been the case. Only 31% of those calls have been overturned, which is down from 52% last season and 42% in 2010. The challenge call sends the play to an upstairs booth, where it's reviewed by an official who isn't a replacement.

To be sure, there are some changes this year that could affect replays. Starting this season, there's an automatic replay for touchdowns and turnovers, meaning coaches can use challenges more freely on other aspects of the game.