This was definitely my favourite episode of the season, and possibly of the series. I thought Kirk was badly cast, but actually after seeing him in this episode, I get it. He is not our Kirk, but he actually does bring something very Kirk-ish to the role that I hadn't appreciated previously.
That is an excellent way of stating it, re Kirk. He wasn't doing it for me, and I thought I had it figured. He looks like Pine, who tried to mimic Shatner's mannerisms, but didn't really deliver the Shatnerisms. Here I was able to accept him as his own thing, and it was fine.