"Poison Pen" was not what I expected it to be at all. Normally, with Elementary episodes you get a murder, a case with some twists and a resolution. Throw in some Joan and Sherlock banter and tension, you've got yourself a quality hour of television.
But that wasn't that case here. We all got to see a different side to Sherlock, not just Holmes but the guy who was bullied back when he was kid. We learned of his first love and how she helped realize who he was. Most importantly, we saw a more sensitive side to him.