Wow. That episode was insane. There will be spoilers in this post, so read at your own warning.
I watched the episode yesterday evening, and based on how episode five ("Alpine Shepherd Boy", formerly titled "Jello"), ended, I knew we'd be diving deeper into everybody's favorite cleaner/enforcer/parking booth worker/troll, Mike Ehrmantraut. But man, I didn't expect what we got.
Episode six, titled Five-O, goes into Mike's mystery with the Philadelphia PD. Mike's son, Matty, also a Philly cop, was killed months before Better Call Saul started. Three months following his death, his partners in the force show up dead. The next day, Mike is in Albuquerque. Some guys from the Philly PD show up at his door, and he's taken in for questioning, as he's a suspect in their death. Mike calls Saul/Jimmy to serve as his lawyer, to set up a little deal to get the cops off his back.
We later learn that Mike's son was killed by his partners, due to illicit dealings and kickbacks, and that his reluctance to finally accept the kickbacks gets him killed. Since he was so reluctant to be corrupted, his partners feared that he would rat them out, so they disposed of him.
Matty was reluctant to go through with this as was said, but Mike told him to do it anyway. We learned it's essentially Mike's fault that his son died.
There's far more to the episode than that, it's very nuanced, and greater depth than my reviewing skills can handle right now. But, my next point is this.
Jonathan Banks' acting in the final scenes of the episode. We see Mike Ehrmantraut, one of the hardest, most stoic characters in the BB/BCS cry. When he's explaining to Matty's widow, and coming clean, the way he breaks down when he delivers the line, "I broke my boy!" It will send chills down your spine, and you'll get a case of the feels as well. He deserves an Emmy for this scene alone. Just the raw emotion, the heartbreak that Mike is experiencing, that we've never seen before, and Jonathan Banks just kills it. The pain in his face, and in his voice.
I think it's better than any of his other performances of either show in this universe. Saul/Jimmy is only in the episode for just a few short minutes, and that's all he really needs. I loved this episode, and I think Better Call Saul certainly has the potential to live up to Breaking Bad. Maybe it won't be as good, but it's certainly putting up a fight, and episodes like this are proof that Vince Gilligan, Peter Gould, and their team know exactly what they're doing.