I rather enjoyed Louis' story, and Gretchen's, but could have done without some particular elements of this episode.
Cons:
Mainly, I thought Sam's plot thread was unnecessary. It wasn't bad, but it just sort of rehashed things we already know about her. Sam tries to poach a client from her old firm, gets mixed up in some old sketchy behavior, and ultimately ends up losing a client instead of gaining one. Along the way, Harvey is there to try and keep her in line. I liked Harvey interfering and making the right call, but what I was less crazy about was Sam trying to cross a line, failing to do so, and learning apparently nothing from it. She did something really sketchy in her past, and it appears that she learned absolutely nothing from it.
Pros:
Like I said, I did enjoy Harvey being the voice of reason in Sam's plot. Despite this show's many flaws, I still maintain that Harvey's character growth is one of the more nuanced and well thought-out that I've ever seen on a TV show like this, particularly with such a cliche character to start things off with. Harvey was the kind of guy who did the reckless stuff he is now cautioning Sam against. But he's not being a hypocrite - he genuinely has grown and learned over several seasons. One of his most important lessons is that it's possible for him to lose. He can't go in to every scenario ready to battle it to the ends of the earth - sometimes he has to give in. What taught him this? Mike going to prison. It's the first Mike mention we've gotten in a few episodes, so of course I had to mention it. I miss him so much.