I actually like the new Chief. She adds a little resistance, and it's fun trying to watch him win her over or try to white knight Kate when she's getting on to her. I also think it will add a new dimension to Kate's character. The old captain always praised her, and now she's really having to show how good she is.
Also looking forward to seeing what looks to be going on with Ryan in next week's episode. He's got the naive, good boy image. Maybe this will add some depth to his character. Or, no one has heard any rumors about him possibly leaving the show, have you?