Difficulty is in the eye of the beholder. I would encourage people to look for programs where they place an emphasis on you taking a lead role in seeing cases and developing a thought process on how to work up them up, in essence, actually taking responsibility for your cases. Of course, there are also other ways to get solid training (didactics, unknown sessions, etc) which are important as well. I really felt that at a place where I rotated (mid-tier smallish academic hospital), the residents could really skate by during signout and in essence not even really understand why something was being diagnosed the way that it was. Of course, I'm not going to generalize across the board with my n=1 mid-size program experience, but it would be something I would inquire about (are residents observers or are they responsible for the cases after the grossing is done?) You can skate at most programs (even the big ones), but I think some places tend to place an emphasis on resident's taking ownership of their cases, which forces your brain to actually work and learn, whcih ultimately helps you be a better pathologist. Most of this is probably individual dependent, but it helps when the faculty push you as well and aren't there ust trying to move glass.