Last year around this time, a lot of the referees you're seeing now during NFL games were reffing minor college games and even some high school games.
As you can imagine, nobody expects perfection out of them. The mistakes have been talked about and criticized by many, but on Sunday during the Pats-Titans game, there weren't many big errors.
Michael Holley gave them a B to a B-plus, while Tom E. Curran and Ron Borges weren't as kind.
Either way, it doesn't appear as if these refs were part of the story on Sunday -- a good thing.