I thought episode 5 dropped the ball a bit on maintaining the quality of the previous 4 episodes.
The abduction of Salvatore Maroni's son seemed rushed, and even though Penguin did have him as leverage, Sal seems to almost run the prison so it seems weird that they just didn't grab Oz up and torture the location out of him. Maybe an extra line that Oz has to call every 30 minutes or he dies would have been useful. Also the scene with Sofia and Johnny at the table with the underlings wasn't convincing to me. I'm paraphrasing but it was along the lines of: "I killed all your bosses and now you should work for me because they used you and never gave you anything, here's a bag of cash, help yourselves"
I enjoyed aspects of it, but not up to par with earlier episodes IMO