Let's play a midseason game. List your biggest surprise, and biggest letdown at both the MLB/MiLB levels this year.
Biggest MLB Surprise: Adam LaRoce. I picked him up from North for the 116th pick last offseason. I was expecting decent counting stats with a .800 OPS being a possibility. His .400+ OBP has been a huge crutch for my offense, and he's done a great job from the cleanup spot in the Nats lineup. (Honorable mentions: Charlie Blackmon, Ian Kinsler)
Biggest MLB Letdown: Easily Eric Hosmer. This offseason he was probably considered a top 50 dynasty player by most. He's been brutal this year. The power has evaporated, he's not stealing, and he's struggling against the fastball. I'm praying for a second half turn around. (Honorable mentions: Justin Masterson, Curtis Granderson)
Biggest MiLB Surprise: I don't have much to choose from, but Josh Bell. Improved on last year's good year, and has landed himself on both Top 50 lists. A strong finish could have him in the top 30.
Biggest MiLB Letdown: Reese McGuire. It's my own fault, I made an uneducated pick at the time. McGuire is similar to Hedges in that most of his value is tied to defense. It doesn't matter if McGuire is great behind the plate if he provides minimal to zero fantasy value. I spent a 9th pick on him and it's turned out terribly. At least I've learned from that error.