I've actually pretty much come to the conclusion that Captain Gates has been a pointless character so far. I get the need to be different than Montgomery was, he was like a father figure to the gang, but at least he also interacted and they consulted with him a lot. Unlike some others in the thread, I have happened to like Gates, but so far she is a non factor in the season. Perhaps that will change as we get closer to May.
Yeah, I was looking forward to her as a foil for Castle - someone who had no tolerance for his BS. However, after a promising start, she softened up a bit on Rick, and now she's seems to have been sidelined. Granted, there's only 42 minutes per week to fit in all the recurring characters, but I'm hoping the writers haven't abandoned the character.