I did like the start and premise of the episode. A murder at the big top. The circus is always creeps-ville for me, and I was waiting and interested to see where it would go.
Now, I don't mind JJ, especially a "little" grown up, with his "love interest". Reminds me of when I was that age. But I think this became too family-centric for my liking. If this one were done in the first season or two, say Johnny and Bruce, this would probably have been a much more involved and mysterious episode.
But it seems this whole show has taken a not so interesting turn. JJ, Sara, Walt...I like them in their places. But this episode seems to tell us that that is going to be the main focus now.